Skip slow file transfers over bluetooth or Google Play with the built in FTP Server.
NavMusic downloads album art and artist photos for a lovely experience with dynamic colors to match.
A watch face that adapts to what you are currently listening to.
Stock android does not have a built-in FTP server but many apps are available that can act as an FTP client.
Nav music does not support creating playlist on the device, but you can use folder view to create a playlist.