Here's another favorite recently rediscovered. This one is all computer animation. What's inventive about this one is the mixture of computer animation and music and the matching.
From the first Animusic DVD. Pipe Dream has been voted one of the 50 greatest animation projects ever (by 3D World magazine). A group of percussion instruments perform music by way of metal balls that fly out from pipes.
I'm still trying to figure out the behind the scenes on this one. Did they program the video and match it to the song, or did they program the environment and instruments and then feed in the song and let the computer "play" them?
Either way... Enjoy!