With iOS 11, MusicKit on iOS lets users play Apple Music and their local music library natively from your apps and games.
As per Apple, MusicKit lets users play Apple Music and their local music library natively from your apps and games. When a user provides permission to their Apple Music account, your app can create playlists, add songs to their library, and play any of the millions of songs in the Apple Music catalog.
Can we play this music if user has not downloaded music from iTunes through MusicKit.
Also, can it be used to seek forward or backward.
MediaPlayer framework provides features for seek forward and backward
MPMusicPlayerController.systemMusicPlayer().beginSeekingForward()
MPMusicPlayerController.systemMusicPlayer().beginSeekingBackward()