This is something I really want, the ability to have a song show up on many albums but only need one copy of it on the disk/ipod. For example, I have the song 'Bohemian Rhapsody' 4 times in my itunes library, one the original release album, Queen's Greatest Hits, and on two compilation albums. I really wish I didn't need to have 4 copies of the file on my disk. I would love the ability to have one copy on the disk and then aliases to it for the three albums. Of course, I could have chose not to rip in the last 3 times, but I don't like partial albums , even if it does end up with duplicate copies of a song on my disk. Does anyone else wish you could have song aliases?