Again, it's not only the matter of importing song!
All songs are linked to animations in the game, and all songs are made to react on touchscreen (maybe I expressed myself wrong, but you understand)
You can't just put the song in, and expect that those touch marks on screen will appear automatically, it's all coded and designed, so you'd have to actually MAKE a game with all three playlists!
Just put all three games on your cart, and play the one that you desire at the given moment!!