So Jack recommended that I go into Windows Media player where I *can* see the file path, and then edit some other tag like "Comment" or something to say "From Emusic". Then in theory iTunes would pick up that new information and I could sort and make playlists based on it.
Only iTunes totally doesn't seem to pick up that info, either because it doesn't re-check or sync the tags, or because it doesn't recognize what I did in WMP, or whatever.
Does anyone know a trick that would let me do what I need to do?? Thanks!