I recently purchased The 99 Darkest Pieces of Classical Music from Amazon. Yeah, it's sucky MP3, but it was free and I'm not a big classical music buff. I have the Album Artist field empty, and every track marked as "Part of a Compilation". So far so good. When I go to change the Artist field of any track, to fix a misspelling or capitalization error, for example, that track is instantly dragged out of the track listing for 99 Darkest and into its own album, with the album name being Unknown Album. This despite the track still being marked as Part of a Compilation. If I restore the original spelling, the track is dragged back into 99 Darkest's list. It's not like iTunes to maintain state like that. What's happening and how do I fix it?