Assuming it's based on what they purchased from LaLa, it's fairly trivial to get them to give you a good copy of an arbitrary track. I tried this when LaLa debuted their "cloud music service", which would scan your library, matching tracks by, as far as I could tell, tags only. I took a random MP3 file, re-tagged it to a track that I didn't own, and ran the Lala scanner. Sure enough, it showed up on Lala as a track that I owned and could listen to an unlimited number of times online. Of course at that point Lala didn't let you re-download matched tracks as Apple will, so it was limited. But I'm forced to assume that if you have the patience, you could get Apple to give you 256Kbps MP3s of albums you don't actually own.