I added them from my laptop - I find the matching pretty lousy, though. Bjork recordings are replaced by acoustic remixes, live-radio performances of songs are replaced by studio recordings, etc. And then of course some of my own songs are replaced by weird recordings I've never heard before. It seems that any time I'm out and about and listen to a playlist for 30-45 minutes, at least 1-2 songs are wrong.
All of these recordings are of course still fine on my laptop itself - I know not to delete those.