[MrGilbert]

Of course. 7digital comes to mind, HDTracks - and, of course, Amazon. The files are all yours to keep.

In fact, I find it easier to get non-drm music files than movies.

[manuelfcreis]

I would also bandcamp to this list!

[flyinghamster]

You can also download 320 Kbps MP3s of albums/tracks you buy on Google Play. I've done that a few times, because I don't trust the cloud.