I've been updating my songs in iTunes to include cover art. I don't understand why the cover art on some songs by the the same artist show as one cover, while others are separate. For example: Say I have a playlist for musicals which includes Cats, Phantom, and Les Mis. As I scroll through the playlist, the songs for Cats will scroll through one by one showing each song, then Phantom is just one cover for 30+ songs (one click and then it sends me to the next musical), and finally Les Mis scrolls through one song at a time. What is the setting that makes it do that???