Let the muzak-games begin!
Music Catch—The name is pretty descriptive, actually. Catch colorful shapes as they come onto the playing field in sync with the music. Red shapes are bad, all other colored shapes are good—especially yellow ones, which give bonus points and add catching surface area. What's really cool is you can upload your own music to influence game play. (Thanks to Tom Nayder for the recommendation.)
Music Bounce—This time the game doesn't dictate the music, you do. Release a series of bouncy balls in an effort to break all of them before they regenerate. When one breaks, it makes a cool sound. When a number of them break in rhythm, it makes a cool beat. It takes a bit of time to figure out the game play. Once you do, it’s hard to stop.