iOS Pick: SongShift
Jason Snell's app cap on iOS Today 330 is SongShift. One of the biggest lock-ins for music subscription services is playlists. If you switch to a different service, you'll lose all of those playlists you've created. This app will log into your music services and transfer your playlists to other services.
SongShift has 3D shortcuts for quick access, and an iOS 10 widget. It even has an iMessage extension that allows you to share songs with friends and allow them to import them to the music subscription service of their choice.
SongShift is free to download, with in-app purchases to remove ads and for Spotify Export.