Features that are in the original app, but need to be supported by music providers. These will mostly be added as optional methods in the manifest file.

Sources

• PlaylistSource (get results for a playlist based on a provided id)
• UserSource (get information about a user, can be whatever makes sense (which is an improvement over UWP))
• Related source (get related music)

Resolvers

• Viewing playlists
• Adding / removing tracks to and from playlists
• Creating playlists
• Get playlist tracks
• Get extended user information? (tie in with last.fm integration)
• Liking / unliking tracks
• Getting like status
• Getting data for a single track
• Getting data for a list of tracks
• Callback for when a track changes (useful for local history on a service?)

Implemented

• Core
• iOS
• UWP