I have ripped down all 5 of my Classic Disney collection CD's (just about every song you can think of from most Disney movies up to about Toy Story), all of my Disney park CD's, and DD's Disney Mania CD's. DD9 has the contents of all of the above on her MP3 player. Also some songs from the Playhouse Disney and Nick Jr. CD's.
With that (we have very eclectic music tastes, and the kids share them LOL) she has some 60's rock (Monkees, Beatles, etc), and some folk music (Peter, Paul and Mary, the Irish Rovers, etc) - she loves songs like "If I Had a Hammer", "Tie Me Kangaroo Down", "Puff the Magic Dragon", "This Land is Your Land", etc. She has many works by Henry Mancini - both the little kids LOVE his music - he wrote things like the theme from "The Pink Panther" and "Hawaii 5-O"... they love to dance to his music.
Finally, she has a few songs that are currently popular, that her dad and I like and I think are OK for her to listen to - she hears them on the stereo in the car anyway.. and a few anime themes and other weird stuff that DD15 listens to.