Renown Canadian animator Norman McLaren made this short titled "Begone Dull Care" in 1949. Set to Oscar Peterson's jazz ensemble, it does a phenomenal job at visualizing music using simple means. McLaren scratched right onto film to create these great images.
Though the whole piece is totally worth watching, the part I like best begins at 3:32. A number of white lines do a sort of dance against a black background. It is so simple, and yet it fits the animation so well.
Notice all of the nuances he uses to set up a natural visual language to accompany the swells in the music. I especially love the way he uses to lines coming closer together to recreate a tension or build present in the music--fabulous!