[edwellbrook]

At the moment it imports from the Music.app (so whatever you've synced with iTunes). Adding more providers in the next few months

[chrisseaton]

I didn't realise you could have standalone music files in the Music any more! I thought it was all streaming Apple Music now. I wouldn't even know where to get standalone music files from.

[tempodox]

Just drag the music files from your library to your plugged-in iDevice in iFumes on the Mac. You can also buy and download them on-device with the iTunes Store app.