diff --git a/src/core/library/QueryRegistry.cpp b/src/core/library/QueryRegistry.cpp
index 2a7f17950..54e831379 100644
--- a/src/core/library/QueryRegistry.cpp
+++ b/src/core/library/QueryRegistry.cpp
@@ -37,16 +37,17 @@
 #include "QueryRegistry.h"
 #include <core/library/query/AlbumListQuery.h>
 #include <core/library/query/AllCategoriesQuery.h>
-//#include <core/library/query/AppendPlaylistQuery.h>
+#include <core/library/query/AppendPlaylistQuery.h>
 #include <core/library/query/GetPlaylistQuery.h>
 #include <core/library/query/CategoryListQuery.h>
 #include <core/library/query/CategoryTrackListQuery.h>
-//#include <core/library/query/DeletePlaylistQuery.h>
-//#include <core/library/query/DirectoryTrackListQuery.h>
+#include <core/library/query/DeletePlaylistQuery.h>
+#include <core/library/query/DirectoryTrackListQuery.h>
 #include <core/library/query/LyricsQuery.h>
-// #include <core/library/query/MarkTrackPlayedQuery.h>
-// #include <core/library/query/NowPlayingTrackListQuery.h>
-// #include <core/library/query/SavePlaylistQuery.h>
+#include <core/library/query/MarkTrackPlayedQuery.h>
+#include <core/library/query/NowPlayingTrackListQuery.h>
+#include <core/library/query/PersistedPlayQueueQuery.h>
+#include <core/library/query/SavePlaylistQuery.h>
 #include <core/library/query/SearchTrackListQuery.h>
 #include <core/library/query/SetTrackRatingQuery.h>
 #include <core/library/query/TrackMetadataQuery.h>
@@ -67,8 +68,9 @@ namespace musik { namespace core { namespace library {
             if (name == AllCategoriesQuery::kQueryName) {
                 return AllCategoriesQuery::DeserializeQuery(data);
             }
-            //if (name == AppendPlaylistQuery::kQueryName) {
-            //}
+            if (name == AppendPlaylistQuery::kQueryName) {
+                return AppendPlaylistQuery::DeserializeQuery(library, data);
+            }
             if (name == GetPlaylistQuery::kQueryName) {
                 return GetPlaylistQuery::DeserializeQuery(library, data);
             }
@@ -78,19 +80,21 @@ namespace musik { namespace core { namespace library {
             if (name == CategoryTrackListQuery::kQueryName) {
                 return CategoryTrackListQuery::DeserializeQuery(library, data);
             }
-            //if (name == DeletePlaylistQuery::kQueryName) {
-            //}
-            //if (name == DirectoryTrackListQuery::kQueryName) {
-            //}
+            if (name == DeletePlaylistQuery::kQueryName) {
+                return DeletePlaylistQuery::DeserializeQuery(library, data);
+            }
+            if (name == DirectoryTrackListQuery::kQueryName) {
+                return DirectoryTrackListQuery::DeserializeQuery(library, data);
+            }
             if (name == LyricsQuery::kQueryName) {
                 return LyricsQuery::DeserializeQuery(data);
             }
-            //if (name == MarkTrackPlayedQuery::kQueryName) {
-            //}
-            //if (name == NowPlayingTrackListQuery::kQueryName) {
-            //}
-            //if (name == SavePlaylistQuery::kQueryName) {
-            //}
+            if (name == MarkTrackPlayedQuery::kQueryName) {
+                return MarkTrackPlayedQuery::DeserializeQuery(data);
+            }
+            if (name == SavePlaylistQuery::kQueryName) {
+                return SavePlaylistQuery::DeserializeQuery(library, data);
+            }
             if (name == SearchTrackListQuery::kQueryName) {
                 return SearchTrackListQuery::DeserializeQuery(library, data);
             }
@@ -102,6 +106,15 @@ namespace musik { namespace core { namespace library {
             }
             return std::shared_ptr<ISerializableQuery>();
         }
+
+        bool IsLocalOnlyQuery(const std::string& queryName) {
+            static const std::set<std::string> sLocalOnlyQuerys = {
+                NowPlayingTrackListQuery::kQueryName,
+                PersistedPlayQueueQuery::kQueryName
+            };
+
+            return sLocalOnlyQuerys.find(queryName) != sLocalOnlyQuerys.end();
+        }
     }
 
 } } }
diff --git a/src/core/library/QueryRegistry.h b/src/core/library/QueryRegistry.h
index 387aa1dc3..518ce42ff 100644
--- a/src/core/library/QueryRegistry.h
+++ b/src/core/library/QueryRegistry.h
@@ -44,6 +44,8 @@ namespace musik { namespace core { namespace library {
     namespace QueryRegistry {
         std::shared_ptr<musik::core::db::ISerializableQuery> CreateLocalQueryFor(
             const std::string& name, const std::string& data, musik::core::ILibraryPtr library);
+
+        bool IsLocalOnlyQuery(const std::string& queryName);
     }
 
 } } }
diff --git a/src/core/library/RemoteLibrary.cpp b/src/core/library/RemoteLibrary.cpp
index a7f43db21..a7f8ec8a9 100644
--- a/src/core/library/RemoteLibrary.cpp
+++ b/src/core/library/RemoteLibrary.cpp
@@ -131,6 +131,11 @@ void RemoteLibrary::Close() {
 }
 
 int RemoteLibrary::Enqueue(QueryPtr query, unsigned int options, Callback callback) {
+    if (QueryRegistry::IsLocalOnlyQuery(query->Name())) {
+        auto defaultLocalLibrary = LibraryFactory::Instance().Default();
+        return defaultLocalLibrary->Enqueue(query, options, callback);
+    }
+    
     auto serializableQuery = std::dynamic_pointer_cast<ISerializableQuery>(query);
 
     if (serializableQuery) {
@@ -206,7 +211,7 @@ void RemoteLibrary::RunQuery(QueryContextPtr context, bool notify) {
                     this->QueryCompleted(localQuery.get());
                 }
             }
-            if (context->callback) {
+            else if (context->callback) {
                 context->callback(context->query);
             }
         };
diff --git a/src/core/library/query/AppendPlaylistQuery.cpp b/src/core/library/query/AppendPlaylistQuery.cpp
index 708b90788..f3f5d6f9e 100644
--- a/src/core/library/query/AppendPlaylistQuery.cpp
+++ b/src/core/library/query/AppendPlaylistQuery.cpp
@@ -36,10 +36,12 @@
 #include "AppendPlaylistQuery.h"
 #include <core/library/track/LibraryTrack.h>
 #include <core/library/query/TrackMetadataQuery.h>
+#include <core/library/query/util/Serialization.h>
 #include <core/library/LocalLibraryConstants.h>
 #include <core/runtime/Message.h>
 #include <core/support/Messages.h>
 #include <core/db/Statement.h>
+#include <json.hpp>
 
 using musik::core::db::Statement;
 using musik::core::db::Row;
@@ -47,10 +49,13 @@ using musik::core::db::Row;
 using namespace musik::core;
 using namespace musik::core::db;
 using namespace musik::core::library::query;
+using namespace musik::core::library::query::serialization;
 using namespace musik::core::library::constants;
 using namespace musik::core::sdk;
 using namespace musik::core::runtime;
 
+const std::string AppendPlaylistQuery::kQueryName = "AppendPlaylistQuery";
+
 static std::string INSERT_PLAYLIST_TRACK_QUERY =
     "INSERT INTO playlist_tracks (track_external_id, source_id, playlist_id, sort_order) "
     "VALUES (?, ?, ?, ?)";
@@ -87,9 +92,12 @@ AppendPlaylistQuery::AppendPlaylistQuery(
 }
 
 bool AppendPlaylistQuery::OnRun(musik::core::db::Connection &db) {
+    this->result = false;
+
     ITrackList* tracks = sharedTracks ? sharedTracks.get() : rawTracks;
 
     if (!tracks || !tracks->Count() || playlistId == 0) {
+        this->result = true;
         return true;
     }
 
@@ -148,5 +156,45 @@ bool AppendPlaylistQuery::OnRun(musik::core::db::Connection &db) {
     this->library->GetMessageQueue().Broadcast(
         Message::Create(nullptr, message::PlaylistModified, playlistId));
 
+    this->result = true;
     return true;
+}
+
+/* ISerializableQuery */
+
+std::string AppendPlaylistQuery::SerializeQuery() {
+    ITrackList* tracks = rawTracks ? rawTracks : sharedTracks.get();
+    nlohmann::json output = {
+    { "name", kQueryName },
+        { "options", {
+            { "playlistId", this->playlistId },
+            { "offset", this->offset },
+            { "tracks", ITrackListToJsonIdList(*tracks) }
+        }}
+    };
+    return output.dump();
+}
+
+std::string AppendPlaylistQuery::SerializeResult() {
+    nlohmann::json output = { { "result", this->result } };
+    return output.dump();
+}
+
+void AppendPlaylistQuery::DeserializeResult(const std::string& data) {
+    auto input = nlohmann::json::parse(data);
+    this->SetStatus(input["result"].get<bool>() == true
+        ? IQuery::Finished : IQuery::Failed);
+}
+
+std::shared_ptr<AppendPlaylistQuery> AppendPlaylistQuery::DeserializeQuery(
+    musik::core::ILibraryPtr library, const std::string& data)
+{
+    auto options = nlohmann::json::parse(data)["options"];
+    auto trackList = std::make_shared<TrackList>(library);
+    TrackListFromJson(options["tracks"], *trackList, library, true);
+    return std::make_shared<AppendPlaylistQuery>(
+        library,
+        options["playlistId"].get<int64_t>(),
+        trackList,
+        options["offset"].get<int>());
 }
\ No newline at end of file
diff --git a/src/core/library/query/AppendPlaylistQuery.h b/src/core/library/query/AppendPlaylistQuery.h
index 69ed01e71..7bb81cc2f 100644
--- a/src/core/library/query/AppendPlaylistQuery.h
+++ b/src/core/library/query/AppendPlaylistQuery.h
@@ -43,6 +43,8 @@ namespace musik { namespace core { namespace library { namespace query {
 
     class AppendPlaylistQuery : public musik::core::library::query::QueryBase {
         public:
+            static const std::string kQueryName;
+
             AppendPlaylistQuery(
                 musik::core::ILibraryPtr library,
                 const int64_t playlistId,
@@ -57,17 +59,24 @@ namespace musik { namespace core { namespace library { namespace query {
 
             virtual ~AppendPlaylistQuery() { }
 
-            std::string Name() { return "AppendPlaylistQuery"; }
+            std::string Name() { return kQueryName; }
+
+            /* ISerializableQuery */
+            virtual std::string SerializeQuery();
+            virtual std::string SerializeResult();
+            virtual void DeserializeResult(const std::string& data);
+            static std::shared_ptr<AppendPlaylistQuery> DeserializeQuery(
+                musik::core::ILibraryPtr library, const std::string& data);
 
         protected:
             virtual bool OnRun(musik::core::db::Connection &db);
 
-            int64_t playlistId;
-
             musik::core::ILibraryPtr library;
             std::shared_ptr<musik::core::TrackList> sharedTracks;
             musik::core::sdk::ITrackList* rawTracks;
+            int64_t playlistId;
             int offset;
+            bool result{ false };
     };
 
 } } } }
diff --git a/src/core/library/query/CategoryTrackListQuery.cpp b/src/core/library/query/CategoryTrackListQuery.cpp
index f0dbb96df..cbb817a0e 100755
--- a/src/core/library/query/CategoryTrackListQuery.cpp
+++ b/src/core/library/query/CategoryTrackListQuery.cpp
@@ -214,25 +214,17 @@ std::string CategoryTrackListQuery::SerializeQuery() {
             { "sortType", sortType }
         }}
     };
-    return output.dump();
+    return FinalizeSerializedQueryWithLimitAndOffset(output);
 }
 
 std::string CategoryTrackListQuery::SerializeResult() {
-    nlohmann::json output = {
-        { "result", {
-            { "headers", *this->headers },
-            { "trackList", TrackListToJson(*this->result, true) }
-        }}
-    };
-    return output.dump();
+    return InitializeSerializedResultWithHeadersAndTrackList().dump();
 }
 
 void CategoryTrackListQuery::DeserializeResult(const std::string& data) {
     this->SetStatus(IQuery::Failed);
     nlohmann::json result = nlohmann::json::parse(data)["result"];
-    this->result = std::make_shared<TrackList>(this->library);
-    TrackListFromJson(result["trackList"], *this->result, this->library, true);
-    JsonArrayToSet<std::set<size_t>, size_t>(result["headers"], *this->headers);
+    this->DeserializeTrackListAndHeaders(result, this->library, this->result, this->headers);
     this->SetStatus(IQuery::Finished);
 }
 
@@ -244,6 +236,7 @@ std::shared_ptr<CategoryTrackListQuery> CategoryTrackListQuery::DeserializeQuery
         library,
         options["filter"].get<std::string>(),
         options["sortType"].get<TrackSortType>());
+    result->ExtractLimitAndOffsetFromDeserializedQuery(options);
     PredicateListFromJson(options["regularPredicateList"], result->regular);
     PredicateListFromJson(options["extendedPredicateList"], result->extended);
     result->ScanPredicateListsForQueryType();
diff --git a/src/core/library/query/DeletePlaylistQuery.cpp b/src/core/library/query/DeletePlaylistQuery.cpp
index 5ef25c151..cbfb6c72d 100644
--- a/src/core/library/query/DeletePlaylistQuery.cpp
+++ b/src/core/library/query/DeletePlaylistQuery.cpp
@@ -40,11 +40,15 @@
 #include <core/support/Messages.h>
 #include <core/runtime/Message.h>
 
+#include <json.hpp>
+
 using namespace musik::core;
 using namespace musik::core::db;
 using namespace musik::core::library::query;
 using namespace musik::core::runtime;
 
+const std::string DeletePlaylistQuery::kQueryName = "DeletePlaylistQuery";
+
 static std::string DELETE_PLAYLIST_TRACKS_QUERY =
     "DELETE FROM playlist_tracks WHERE playlist_id=?;";
 
@@ -68,20 +72,53 @@ bool DeletePlaylistQuery::OnRun(musik::core::db::Connection &db) {
 
     if (deleteTracks.Step() == db::Error) {
         transaction.Cancel();
-        return false;
+        this->result = false;
     }
+    else {
+        /* delete the container */
+        Statement deletePlaylist(DELETE_PLAYLIST_QUERY.c_str(), db);
+        deletePlaylist.BindInt64(0, this->playlistId);
 
-    /* delete the container */
-    Statement deletePlaylist(DELETE_PLAYLIST_QUERY.c_str(), db);
-    deletePlaylist.BindInt64(0, this->playlistId);
-
-    if (deletePlaylist.Step() == db::Error) {
-        transaction.Cancel();
-        return false;
+        if (deletePlaylist.Step() == db::Error) {
+            transaction.Cancel();
+            this->result = false;
+        }
+        else {
+            this->library->GetMessageQueue().Broadcast(
+                Message::Create(nullptr, message::PlaylistDeleted, playlistId));
+            this->result = true;
+        }
     }
+    return this->result;
+}
 
-    this->library->GetMessageQueue().Broadcast(
-        Message::Create(nullptr, message::PlaylistDeleted, playlistId));
 
-    return true;
+/* ISerializableQuery */
+
+std::string DeletePlaylistQuery::SerializeQuery() {
+    nlohmann::json output = {
+    { "name", kQueryName },
+        { "options", {
+            { "playlistId", this->playlistId },
+        }}
+    };
+    return output.dump();
+}
+
+std::string DeletePlaylistQuery::SerializeResult() {
+    nlohmann::json output = { { "result", this->result } };
+    return output.dump();
+}
+
+void DeletePlaylistQuery::DeserializeResult(const std::string& data) {
+    auto input = nlohmann::json::parse(data);
+    this->SetStatus(input["result"].get<bool>() == true
+        ? IQuery::Finished : IQuery::Failed);
+}
+
+std::shared_ptr<DeletePlaylistQuery> DeletePlaylistQuery::DeserializeQuery(
+    musik::core::ILibraryPtr library, const std::string& data)
+{
+    auto options = nlohmann::json::parse(data)["options"];
+    return std::make_shared<DeletePlaylistQuery>(library, options["playlistId"].get<int64_t>());
 }
\ No newline at end of file
diff --git a/src/core/library/query/DeletePlaylistQuery.h b/src/core/library/query/DeletePlaylistQuery.h
index fe6fea855..948251d69 100644
--- a/src/core/library/query/DeletePlaylistQuery.h
+++ b/src/core/library/query/DeletePlaylistQuery.h
@@ -42,13 +42,22 @@ namespace musik { namespace core { namespace library { namespace query {
 
     class DeletePlaylistQuery : public musik::core::library::query::QueryBase {
         public:
+            static const std::string kQueryName;
+
             DeletePlaylistQuery(
                 musik::core::ILibraryPtr library,
                 const int64_t playlistId);
 
             virtual ~DeletePlaylistQuery();
 
-            virtual std::string Name() { return "DeletePlaylistQuery"; }
+            virtual std::string Name() { return kQueryName; }
+
+            /* ISerializableQuery */
+            virtual std::string SerializeQuery();
+            virtual std::string SerializeResult();
+            virtual void DeserializeResult(const std::string& data);
+            static std::shared_ptr<DeletePlaylistQuery> DeserializeQuery(
+                musik::core::ILibraryPtr library, const std::string& data);
 
         protected:
             virtual bool OnRun(musik::core::db::Connection &db);
@@ -56,6 +65,7 @@ namespace musik { namespace core { namespace library { namespace query {
         private:
             int64_t playlistId;
             musik::core::ILibraryPtr library;
+            bool result{ false };
     };
 
 } } } }
diff --git a/src/core/library/query/DirectoryTrackListQuery.cpp b/src/core/library/query/DirectoryTrackListQuery.cpp
index a90dda9e3..ad44d1ef3 100644
--- a/src/core/library/query/DirectoryTrackListQuery.cpp
+++ b/src/core/library/query/DirectoryTrackListQuery.cpp
@@ -34,6 +34,7 @@
 
 #include "pch.hpp"
 #include <core/library/LocalLibraryConstants.h>
+#include <core/library/query/util/Serialization.h>
 #include <core/i18n/Locale.h>
 #include "DirectoryTrackListQuery.h"
 #include "CategoryTrackListQuery.h"
@@ -44,8 +45,11 @@ using musik::core::ILibraryPtr;
 
 using namespace musik::core::db;
 using namespace musik::core::library::query;
+using namespace musik::core::library::query::serialization;
 using namespace musik::core::library;
 
+const std::string DirectoryTrackListQuery::kQueryName = "DirectoryTrackListQuery";
+
 DirectoryTrackListQuery::DirectoryTrackListQuery(
     ILibraryPtr library,
     const std::string& directory,
@@ -101,3 +105,39 @@ bool DirectoryTrackListQuery::OnRun(Connection& db) {
 
     return true;
 }
+
+/* ISerializableQuery */
+
+std::string DirectoryTrackListQuery::SerializeQuery() {
+    nlohmann::json output = {
+        { "name", kQueryName },
+        { "options", {
+            { "directory", directory },
+            { "filter", filter },
+        }}
+    };
+    return FinalizeSerializedQueryWithLimitAndOffset(output);
+}
+
+std::string DirectoryTrackListQuery::SerializeResult() {
+    return InitializeSerializedResultWithHeadersAndTrackList().dump();
+}
+
+void DirectoryTrackListQuery::DeserializeResult(const std::string& data) {
+    this->SetStatus(IQuery::Failed);
+    nlohmann::json result = nlohmann::json::parse(data)["result"];
+    this->DeserializeTrackListAndHeaders(result, this->library, this->result, this->headers);
+    this->SetStatus(IQuery::Finished);
+}
+
+std::shared_ptr<DirectoryTrackListQuery> DirectoryTrackListQuery::DeserializeQuery(
+    ILibraryPtr library, const std::string& data)
+{
+    auto options = nlohmann::json::parse(data)["options"];
+    auto result = std::make_shared<DirectoryTrackListQuery>(
+        library,
+        options["directory"].get<std::string>(),
+        options["filter"].get<std::string>());
+    result->ExtractLimitAndOffsetFromDeserializedQuery(options);
+    return result;
+}
diff --git a/src/core/library/query/DirectoryTrackListQuery.h b/src/core/library/query/DirectoryTrackListQuery.h
index 1dff7e37a..0635a1d10 100644
--- a/src/core/library/query/DirectoryTrackListQuery.h
+++ b/src/core/library/query/DirectoryTrackListQuery.h
@@ -41,6 +41,8 @@ namespace musik { namespace core { namespace library { namespace query {
 
     class DirectoryTrackListQuery : public TrackListQueryBase {
         public:
+            static const std::string kQueryName;
+
             DirectoryTrackListQuery(
                 musik::core::ILibraryPtr library,
                 const std::string& directory,
@@ -48,11 +50,18 @@ namespace musik { namespace core { namespace library { namespace query {
 
             virtual ~DirectoryTrackListQuery();
 
-            virtual std::string Name() { return "DirectoryTrackListQuery"; }
+            virtual std::string Name() { return kQueryName; }
             virtual Result GetResult() { return this->result; }
             virtual Headers GetHeaders() { return this->headers; }
             virtual size_t GetQueryHash() { return this->hash; }
 
+            /* ISerializableQuery */
+            virtual std::string SerializeQuery();
+            virtual std::string SerializeResult();
+            virtual void DeserializeResult(const std::string& data);
+            static std::shared_ptr<DirectoryTrackListQuery> DeserializeQuery(
+                musik::core::ILibraryPtr library, const std::string& data);
+
         protected:
             virtual bool OnRun(musik::core::db::Connection &db);
 
diff --git a/src/core/library/query/GetPlaylistQuery.cpp b/src/core/library/query/GetPlaylistQuery.cpp
index adca22b99..c1961d0e6 100644
--- a/src/core/library/query/GetPlaylistQuery.cpp
+++ b/src/core/library/query/GetPlaylistQuery.cpp
@@ -111,25 +111,17 @@ std::string GetPlaylistQuery::SerializeQuery() {
             { "playlistId", playlistId },
         }}
     };
-    return output.dump();
+    return FinalizeSerializedQueryWithLimitAndOffset(output);
 }
 
 std::string GetPlaylistQuery::SerializeResult() {
-    nlohmann::json output = {
-        { "result", {
-            { "headers", *this->headers },
-            { "trackList", TrackListToJson(*this->result, true) }
-        }}
-    };
-    return output.dump();
+    return InitializeSerializedResultWithHeadersAndTrackList().dump();
 }
 
 void GetPlaylistQuery::DeserializeResult(const std::string& data) {
     this->SetStatus(IQuery::Failed);
     nlohmann::json result = nlohmann::json::parse(data)["result"];
-    this->result = std::make_shared<TrackList>(this->library);
-    TrackListFromJson(result["trackList"], *this->result, this->library, true);
-    JsonArrayToSet<std::set<size_t>, size_t>(result["headers"], *this->headers);
+    this->DeserializeTrackListAndHeaders(result, this->library, this->result, this->headers);
     this->SetStatus(IQuery::Finished);
 }
 
@@ -137,6 +129,8 @@ std::shared_ptr<GetPlaylistQuery> GetPlaylistQuery::DeserializeQuery(
     musik::core::ILibraryPtr library, const std::string& data)
 {
     auto options = nlohmann::json::parse(data)["options"];
-    return std::make_shared<GetPlaylistQuery>(
+    auto result = std::make_shared<GetPlaylistQuery>(
         library, options["playlistId"].get<int64_t>());
+    result->ExtractLimitAndOffsetFromDeserializedQuery(options);
+    return result;
 }
\ No newline at end of file
diff --git a/src/core/library/query/MarkTrackPlayedQuery.cpp b/src/core/library/query/MarkTrackPlayedQuery.cpp
index 57f0311fc..b1221175e 100644
--- a/src/core/library/query/MarkTrackPlayedQuery.cpp
+++ b/src/core/library/query/MarkTrackPlayedQuery.cpp
@@ -34,11 +34,14 @@
 
 #include "pch.hpp"
 #include "MarkTrackPlayedQuery.h"
+#include <json.hpp>
 
 using namespace musik::core::db;
 using namespace musik::core::library::query;
 using namespace musik::core::sdk;
 
+const std::string MarkTrackPlayedQuery::kQueryName = "MarkTrackPlayedQuery";
+
 MarkTrackPlayedQuery::MarkTrackPlayedQuery(const int64_t trackId) {
     this->trackId = trackId;
 }
@@ -55,9 +58,34 @@ bool MarkTrackPlayedQuery::OnRun(musik::core::db::Connection &db) {
 
     stmt.BindInt64(0, this->trackId);
 
-    if (stmt.Step() == db::Done) {
-        return true;
-    }
+    this->result = stmt.Step() == db::Done;
+    return this->result;
+}
 
-    return false;
+/* ISerializableQuery */
+
+std::string MarkTrackPlayedQuery::SerializeQuery() {
+    nlohmann::json output = {
+        { "name", kQueryName },
+        { "options", {
+            { "trackId", this->trackId },
+        }}
+    };
+    return output.dump();
+}
+
+std::string MarkTrackPlayedQuery::SerializeResult() {
+    nlohmann::json output = { { "result", this->result } };
+    return output.dump();
+}
+
+void MarkTrackPlayedQuery::DeserializeResult(const std::string& data) {
+    auto input = nlohmann::json::parse(data);
+    this->SetStatus(input["result"].get<bool>() == true
+        ? IQuery::Finished : IQuery::Failed);
+}
+
+std::shared_ptr<MarkTrackPlayedQuery> MarkTrackPlayedQuery::DeserializeQuery(const std::string& data) {
+    auto options = nlohmann::json::parse(data)["options"];
+    return std::make_shared<MarkTrackPlayedQuery>(options["trackId"].get<int64_t>());
 }
\ No newline at end of file
diff --git a/src/core/library/query/MarkTrackPlayedQuery.h b/src/core/library/query/MarkTrackPlayedQuery.h
index 73a70e43c..48e08b630 100644
--- a/src/core/library/query/MarkTrackPlayedQuery.h
+++ b/src/core/library/query/MarkTrackPlayedQuery.h
@@ -40,13 +40,22 @@ namespace musik { namespace core { namespace library { namespace query {
 
     class MarkTrackPlayedQuery: public QueryBase {
         public:
+            static const std::string kQueryName;
+
             MarkTrackPlayedQuery(const int64_t trackId);
             virtual ~MarkTrackPlayedQuery();
             std::string Name() { return "MarkTrackPlayedQuery"; }
 
+            /* ISerializableQuery */
+            virtual std::string SerializeQuery();
+            virtual std::string SerializeResult();
+            virtual void DeserializeResult(const std::string& data);
+            static std::shared_ptr<MarkTrackPlayedQuery> DeserializeQuery(const std::string& data);
+
         protected:
             virtual bool OnRun(musik::core::db::Connection &db);
             int64_t trackId;
+            bool result{ false };
     };
 
 } } } }
diff --git a/src/core/library/query/NowPlayingTrackListQuery.cpp b/src/core/library/query/NowPlayingTrackListQuery.cpp
index 954dc9aa9..b06a51fab 100755
--- a/src/core/library/query/NowPlayingTrackListQuery.cpp
+++ b/src/core/library/query/NowPlayingTrackListQuery.cpp
@@ -49,6 +49,8 @@ using namespace musik::core::db;
 using namespace musik::core::library::constants;
 using namespace musik::core::library::query;
 
+const std::string NowPlayingTrackListQuery::kQueryName = "NowPlayingTrackListQuery";
+
 NowPlayingTrackListQuery::NowPlayingTrackListQuery(
     ILibraryPtr library, musik::core::audio::PlaybackService& playback)
 : library(library)
diff --git a/src/core/library/query/NowPlayingTrackListQuery.h b/src/core/library/query/NowPlayingTrackListQuery.h
index 37598324b..39acc00ab 100755
--- a/src/core/library/query/NowPlayingTrackListQuery.h
+++ b/src/core/library/query/NowPlayingTrackListQuery.h
@@ -43,13 +43,15 @@ namespace musik { namespace core { namespace library { namespace query {
 
     class NowPlayingTrackListQuery : public TrackListQueryBase {
         public:
+            static const std::string kQueryName;
+
             NowPlayingTrackListQuery(
                 musik::core::ILibraryPtr library,
                 musik::core::audio::PlaybackService& playback);
 
             virtual ~NowPlayingTrackListQuery();
 
-            virtual std::string Name() { return "NowPlayingTrackListQuery"; }
+            virtual std::string Name() { return kQueryName; }
             virtual Result GetResult();
             virtual Headers GetHeaders();
             virtual size_t GetQueryHash();
diff --git a/src/core/library/query/PersistedPlayQueueQuery.cpp b/src/core/library/query/PersistedPlayQueueQuery.cpp
index 093affbb5..e6cb82987 100644
--- a/src/core/library/query/PersistedPlayQueueQuery.cpp
+++ b/src/core/library/query/PersistedPlayQueueQuery.cpp
@@ -42,6 +42,8 @@ using namespace musik::core;
 using namespace musik::core::db;
 using namespace musik::core::library::query;
 
+const std::string PersistedPlayQueueQuery::kQueryName = "PersistedPlayQueueQuery";
+
 PersistedPlayQueueQuery::PersistedPlayQueueQuery(
     musik::core::ILibraryPtr library,
     musik::core::audio::PlaybackService& playback,
diff --git a/src/core/library/query/PersistedPlayQueueQuery.h b/src/core/library/query/PersistedPlayQueueQuery.h
index 10411c2b7..21beaabc5 100644
--- a/src/core/library/query/PersistedPlayQueueQuery.h
+++ b/src/core/library/query/PersistedPlayQueueQuery.h
@@ -41,6 +41,8 @@ namespace musik { namespace core { namespace library { namespace query {
 
     class PersistedPlayQueueQuery : public musik::core::library::query::QueryBase {
         public:
+            static const std::string kQueryName;
+
             static PersistedPlayQueueQuery* Save(
                 musik::core::ILibraryPtr library,
                 musik::core::audio::PlaybackService& playback)
@@ -57,7 +59,7 @@ namespace musik { namespace core { namespace library { namespace query {
 
             virtual ~PersistedPlayQueueQuery();
 
-            virtual std::string Name() { return "PersistedPlayQueueQuery"; }
+            virtual std::string Name() { return kQueryName; }
 
         protected:
             virtual bool OnRun(musik::core::db::Connection &db);
diff --git a/src/core/library/query/SavePlaylistQuery.cpp b/src/core/library/query/SavePlaylistQuery.cpp
index 4508833de..ab677e736 100644
--- a/src/core/library/query/SavePlaylistQuery.cpp
+++ b/src/core/library/query/SavePlaylistQuery.cpp
@@ -38,18 +38,25 @@
 
 #include <core/library/track/LibraryTrack.h>
 #include <core/library/query/TrackMetadataQuery.h>
+#include <core/library/query/util/Serialization.h>
+#include <core/library/LocalLibraryConstants.h>
 #include <core/db/ScopedTransaction.h>
 #include <core/db/Statement.h>
 #include <core/runtime/Message.h>
 #include <core/support/Messages.h>
 
 using namespace musik::core;
+using namespace musik::core::sdk;
 using namespace musik::core::db;
+using namespace musik::core::library;
 using namespace musik::core::library::query;
+using namespace musik::core::library::query::serialization;
 using namespace musik::core::runtime;
 
 /* CONSTANTS */
 
+const std::string SavePlaylistQuery::kQueryName = "SavePlaylistQuery";
+
 static std::string CREATE_PLAYLIST_QUERY =
     "INSERT INTO playlists (name) VALUES (?);";
 
@@ -130,7 +137,7 @@ std::shared_ptr<SavePlaylistQuery> SavePlaylistQuery::Append(
     auto result = std::shared_ptr<SavePlaylistQuery>(
         new SavePlaylistQuery(library, playlistId, tracks));
 
-    result->op = AppendOp;
+    result->op = Operation::Append;
 
     return result;
 }
@@ -146,7 +153,7 @@ std::shared_ptr<SavePlaylistQuery> SavePlaylistQuery::Append(
     auto result = std::shared_ptr<SavePlaylistQuery>(
         new SavePlaylistQuery(library, playlistId, categoryType, categoryId));
 
-    result->op = AppendOp;
+    result->op = Operation::Append;
 
     return result;
 }
@@ -162,7 +169,7 @@ SavePlaylistQuery::SavePlaylistQuery(
     this->playlistName = playlistName;
     this->tracks.rawTracks = nullptr;
     this->tracks.sharedTracks = tracks;
-    this->op = CreateOp;
+    this->op = Operation::Create;
 }
 
 SavePlaylistQuery::SavePlaylistQuery(
@@ -175,7 +182,7 @@ SavePlaylistQuery::SavePlaylistQuery(
     this->categoryId = -1;
     this->playlistName = playlistName;
     this->tracks.rawTracks = tracks;
-    this->op = CreateOp;
+    this->op = Operation::Create;
 }
 
 SavePlaylistQuery::SavePlaylistQuery(
@@ -189,7 +196,7 @@ SavePlaylistQuery::SavePlaylistQuery(
     this->categoryId = categoryId;
     this->categoryType = categoryType;
     this->playlistName = playlistName;
-    this->op = CreateOp;
+    this->op = Operation::Create;
 }
 
 SavePlaylistQuery::SavePlaylistQuery(
@@ -200,7 +207,7 @@ SavePlaylistQuery::SavePlaylistQuery(
     this->library = library;
     this->playlistId = playlistId;
     this->tracks.sharedTracks = tracks;
-    this->op = ReplaceOp;
+    this->op = Operation::Replace;
 }
 
 SavePlaylistQuery::SavePlaylistQuery(
@@ -211,7 +218,7 @@ SavePlaylistQuery::SavePlaylistQuery(
     this->library = library;
     this->playlistId = playlistId;
     this->tracks.rawTracks = tracks;
-    this->op = ReplaceOp;
+    this->op = Operation::Replace;
 }
 
 SavePlaylistQuery::SavePlaylistQuery(
@@ -224,7 +231,7 @@ SavePlaylistQuery::SavePlaylistQuery(
     this->playlistId = playlistId;
     this->categoryId = categoryId;
     this->categoryType = categoryType;
-    this->op = AppendOp;
+    this->op = Operation::Append;
 }
 
 SavePlaylistQuery::SavePlaylistQuery(
@@ -236,7 +243,12 @@ SavePlaylistQuery::SavePlaylistQuery(
     this->categoryId = -1;
     this->playlistId = playlistId;
     this->playlistName = playlistName;
-    this->op = RenameOp;
+    this->op = Operation::Rename;
+}
+
+SavePlaylistQuery::SavePlaylistQuery(musik::core::ILibraryPtr library) {
+    this->library = library;
+    this->categoryId = -1;
 }
 
 SavePlaylistQuery::~SavePlaylistQuery() {
@@ -394,13 +406,14 @@ bool SavePlaylistQuery::AppendToPlaylist(musik::core::db::Connection& db) {
 }
 
 bool SavePlaylistQuery::OnRun(musik::core::db::Connection &db) {
+    this->result = false;
     switch (this->op) {
-        case RenameOp: return this->RenamePlaylist(db);
-        case ReplaceOp: return this->ReplacePlaylist(db);
-        case CreateOp: return this->CreatePlaylist(db);
-        case AppendOp: return this->AppendToPlaylist(db);
+        case Operation::Rename: this->result = this->RenamePlaylist(db); break;
+        case Operation::Replace: this->result = this->ReplacePlaylist(db); break;
+        case Operation::Create: this->result = this->CreatePlaylist(db); break;
+        case Operation::Append: this->result = this->AppendToPlaylist(db); break;
     }
-    return false;
+    return this->result;
 }
 
 /* SUPPORTING TYPES */
@@ -445,3 +458,53 @@ TrackPtr SavePlaylistQuery::TrackListWrapper::Get(
 
     return result;
 }
+
+ITrackList* SavePlaylistQuery::TrackListWrapper::Get() {
+    if (sharedTracks) {
+        return sharedTracks.get();
+    }
+    return rawTracks;
+}
+
+/* ISerializableQuery */
+
+std::string SavePlaylistQuery::SerializeQuery() {
+    nlohmann::json output = {
+    { "name", kQueryName },
+        { "options", {
+            { "op", this->op },
+            { "playlistName", this->playlistName },
+            { "categoryType", this->categoryType },
+            { "playlistId", this->playlistId },
+            { "categoryId", this->categoryId },
+            { "tracks", ITrackListToJsonIdList(*tracks.Get()) }
+        }}
+    };
+    return output.dump();
+}
+
+std::string SavePlaylistQuery::SerializeResult() {
+    nlohmann::json output = { { "result", this->result } };
+    return output.dump();
+}
+
+void SavePlaylistQuery::DeserializeResult(const std::string& data) {
+    auto input = nlohmann::json::parse(data);
+    this->SetStatus(input["result"].get<bool>() == true
+        ? IQuery::Finished : IQuery::Failed);
+}
+
+std::shared_ptr<SavePlaylistQuery> SavePlaylistQuery::DeserializeQuery(
+    musik::core::ILibraryPtr library, const std::string& data)
+{
+    auto options = nlohmann::json::parse(data)["options"];
+    auto output = std::shared_ptr<SavePlaylistQuery>(new SavePlaylistQuery(library));
+    output->op = options["op"].get<Operation>();
+    output->playlistName = options["playlistName"].get<std::string>();
+    output->categoryType = options["categoryType"].get<std::string>();
+    output->playlistId = options["playlistId"].get<int64_t>();
+    output->categoryId = options["categoryId"].get<int64_t>();
+    output->tracks.sharedTracks = std::make_shared<TrackList>(library);
+    TrackListFromJson(options["tracks"], *output->tracks.sharedTracks, library, true);
+    return output;
+}
\ No newline at end of file
diff --git a/src/core/library/query/SavePlaylistQuery.h b/src/core/library/query/SavePlaylistQuery.h
index 13784a15b..e9b507d96 100644
--- a/src/core/library/query/SavePlaylistQuery.h
+++ b/src/core/library/query/SavePlaylistQuery.h
@@ -44,6 +44,8 @@ namespace musik { namespace core { namespace library { namespace query {
 
     class SavePlaylistQuery : public musik::core::library::query::QueryBase {
         public:
+            static const std::string kQueryName;
+
             static std::shared_ptr<SavePlaylistQuery> Save(
                 musik::core::ILibraryPtr library,
                 const std::string& playlistName,
@@ -86,12 +88,19 @@ namespace musik { namespace core { namespace library { namespace query {
                 const std::string& categoryType,
                 int64_t categoryId);
 
-            virtual std::string Name() { return "SavePlaylistQuery"; }
+            virtual std::string Name() { return kQueryName; }
 
             virtual ~SavePlaylistQuery();
 
             int64_t GetPlaylistId() const;
 
+            /* ISerializableQuery */
+            virtual std::string SerializeQuery();
+            virtual std::string SerializeResult();
+            virtual void DeserializeResult(const std::string& data);
+            static std::shared_ptr<SavePlaylistQuery> DeserializeQuery(
+                musik::core::ILibraryPtr library, const std::string& data);
+
         protected:
             virtual bool OnRun(musik::core::db::Connection &db);
 
@@ -133,6 +142,8 @@ namespace musik { namespace core { namespace library { namespace query {
                 const int64_t playlistId,
                 const std::string& newName);
 
+            SavePlaylistQuery(musik::core::ILibraryPtr library); /* for query (de)serialization */
+
             struct TrackListWrapper {
                 TrackListWrapper();
                 TrackListWrapper(std::shared_ptr<musik::core::TrackList> shared);
@@ -140,12 +151,18 @@ namespace musik { namespace core { namespace library { namespace query {
                 bool Exists();
                 size_t Count();
                 TrackPtr Get(musik::core::ILibraryPtr library, size_t index);
+                musik::core::sdk::ITrackList* Get();
 
                 std::shared_ptr<musik::core::TrackList> sharedTracks;
                 musik::core::sdk::ITrackList* rawTracks;
             };
 
-            enum Operation { CreateOp, RenameOp, ReplaceOp, AppendOp };
+            enum class Operation: int {
+                Create = 1,
+                Rename = 2,
+                Replace = 3,
+                Append = 4
+            };
 
             bool CreatePlaylist(musik::core::db::Connection &db);
             bool RenamePlaylist(musik::core::db::Connection &db);
@@ -159,6 +176,7 @@ namespace musik { namespace core { namespace library { namespace query {
                 int64_t playlistId,
                 TrackListWrapper& tracks);
 
+            bool result{ false };
             Operation op;
             musik::core::ILibraryPtr library;
             std::string playlistName, categoryType;
diff --git a/src/core/library/query/SearchTrackListQuery.cpp b/src/core/library/query/SearchTrackListQuery.cpp
index f6a4fe3a9..42b06fc44 100755
--- a/src/core/library/query/SearchTrackListQuery.cpp
+++ b/src/core/library/query/SearchTrackListQuery.cpp
@@ -176,32 +176,26 @@ std::string SearchTrackListQuery::SerializeQuery() {
             { "sortType", sortType}
         }}
     };
-    return output.dump();
+    return FinalizeSerializedQueryWithLimitAndOffset(output);
 }
 
 std::string SearchTrackListQuery::SerializeResult() {
-    nlohmann::json output = {
-        { "result", {
-            { "headers", *this->headers },
-            { "trackList", TrackListToJson(*this->result, true) }
-        }}
-    };
-    return output.dump();
+    return InitializeSerializedResultWithHeadersAndTrackList().dump();
 }
 
 void SearchTrackListQuery::DeserializeResult(const std::string& data) {
     this->SetStatus(IQuery::Failed);
     nlohmann::json result = nlohmann::json::parse(data)["result"];
-    this->result = std::make_shared<TrackList>(this->library);
-    TrackListFromJson(result["trackList"], *this->result, this->library, true);
-    JsonArrayToSet<std::set<size_t>, size_t>(result["headers"], *this->headers);
+    this->DeserializeTrackListAndHeaders(result, this->library, this->result, this->headers);
     this->SetStatus(IQuery::Finished);
 }
 
 std::shared_ptr<SearchTrackListQuery> SearchTrackListQuery::DeserializeQuery(musik::core::ILibraryPtr library, const std::string& data) {
     auto options = nlohmann::json::parse(data)["options"];
-    return std::make_shared<SearchTrackListQuery>(
+    auto result = std::make_shared<SearchTrackListQuery>(
         library,
         options["filter"].get<std::string>(),
         options["sortType"].get<TrackSortType>());
+    result->ExtractLimitAndOffsetFromDeserializedQuery(options);
+    return result;
 }
diff --git a/src/core/library/query/SetTrackRatingQuery.cpp b/src/core/library/query/SetTrackRatingQuery.cpp
index b444ac15d..43a84f4a0 100644
--- a/src/core/library/query/SetTrackRatingQuery.cpp
+++ b/src/core/library/query/SetTrackRatingQuery.cpp
@@ -54,13 +54,12 @@ bool SetTrackRatingQuery::OnRun(musik::core::db::Connection &db) {
     Statement stmt("UPDATE tracks SET rating=? WHERE id=?", db);
     stmt.BindInt32(0, this->rating);
     stmt.BindInt64(1, this->trackId);
-    if (stmt.Step() == db::Done) {
-        return true;
-    }
-    return false;
+    this->result = stmt.Step() == db::Done;
+    return this->result;
 }
 
 /* ISerializableQuery */
+
 std::string SetTrackRatingQuery::SerializeQuery() {
     nlohmann::json output = {
         { "name", kQueryName },
@@ -73,7 +72,7 @@ std::string SetTrackRatingQuery::SerializeQuery() {
 }
 
 std::string SetTrackRatingQuery::SerializeResult() {
-    nlohmann::json output = { { "result", true } };
+    nlohmann::json output = { { "result", this->result } };
     return output.dump();
 }
 
diff --git a/src/core/library/query/SetTrackRatingQuery.h b/src/core/library/query/SetTrackRatingQuery.h
index 5f8d05279..bf0584c48 100644
--- a/src/core/library/query/SetTrackRatingQuery.h
+++ b/src/core/library/query/SetTrackRatingQuery.h
@@ -57,6 +57,7 @@ namespace musik { namespace core { namespace library { namespace query {
 
             int64_t trackId;
             int rating;
+            bool result{ false };
     };
 
 } } } }
diff --git a/src/core/library/query/TrackListQueryBase.h b/src/core/library/query/TrackListQueryBase.h
index 3e12b503c..d92a51b22 100755
--- a/src/core/library/query/TrackListQueryBase.h
+++ b/src/core/library/query/TrackListQueryBase.h
@@ -38,6 +38,9 @@
 #include <core/db/Connection.h>
 #include <core/library/track/Track.h>
 #include <core/library/track/TrackList.h>
+#include <core/library/query/util/Serialization.h>
+
+#include <json.hpp>
 
 namespace musik { namespace core { namespace library { namespace query {
 
@@ -67,6 +70,9 @@ namespace musik { namespace core { namespace library { namespace query {
             }
 
         protected:
+
+            /* for IMetadataProxy */
+
             std::string GetLimitAndOffset() {
                 if (this->limit > 0 && this->offset >= 0) {
                     return u8fmt("LIMIT %d OFFSET %d", this->limit, this->offset);
@@ -74,6 +80,40 @@ namespace musik { namespace core { namespace library { namespace query {
                 return "";
             }
 
+            /* for ISerialization */
+
+            const std::string FinalizeSerializedQueryWithLimitAndOffset(nlohmann::json &output) {
+                auto& options = output["options"];
+                options["limit"] = this->limit;
+                options["offset"] = this->offset;
+                return output.dump();
+            }
+
+            void ExtractLimitAndOffsetFromDeserializedQuery(nlohmann::json& options) {
+                this->limit = options.value("limit", -1);
+                this->offset = options.value("offset", 0);
+            }
+
+            nlohmann::json InitializeSerializedResultWithHeadersAndTrackList() {
+                nlohmann::json output = {
+                    { "result", {
+                        { "headers", *this->GetHeaders() },
+                        { "trackList", serialization::TrackListToJson(*this->GetResult(), true) }
+                    }}
+                };
+                return output;
+            }
+
+            void DeserializeTrackListAndHeaders(
+                nlohmann::json &result,
+                ILibraryPtr library,
+                Result tracks,
+                Headers headers)
+            {
+                serialization::TrackListFromJson(result["trackList"], *tracks, library, true);
+                serialization::JsonArrayToSet<std::set<size_t>, size_t>(result["headers"], *headers);
+            }
+
         private:
             int limit, offset;
 
diff --git a/src/core/library/query/util/Serialization.cpp b/src/core/library/query/util/Serialization.cpp
index 7458338ae..6e0117ee3 100644
--- a/src/core/library/query/util/Serialization.cpp
+++ b/src/core/library/query/util/Serialization.cpp
@@ -231,6 +231,14 @@ namespace musik { namespace core { namespace library { namespace query {
             }
         }
 
+        nlohmann::json ITrackListToJsonIdList(const ITrackList& input) {
+            nlohmann::json output;
+            for (size_t i = 0; i < input.Count(); i++) {
+                output.push_back(input.GetId(i));
+            }
+            return output;
+        }
+
     }
 
 } } } }
diff --git a/src/core/library/query/util/Serialization.h b/src/core/library/query/util/Serialization.h
index bfd92c2ea..c4bfead63 100644
--- a/src/core/library/query/util/Serialization.h
+++ b/src/core/library/query/util/Serialization.h
@@ -86,6 +86,9 @@ namespace musik { namespace core { namespace library { namespace query {
             musik::core::ILibraryPtr library,
             bool onlyIds);
 
+        nlohmann::json ITrackListToJsonIdList(
+            const musik::core::sdk::ITrackList& input);
+
         template <typename SetType, typename DataType>
         void JsonArrayToSet(const nlohmann::json& input, SetType& output) {
             for (auto& value : input) {