Audiosurf

Audiosurf is a game where you ride a track while hitting blocks to your mp3s. The technology works most of the time, though things with loud backing tracks won't have as much 'kick' to their main instruments in the game as you would hope. Dubstep = good, Heavy Metal = meh. The game is a bit boring by itself though, and it never really kept me too interested. If you want a casual game to listen to your music, you'll probably be satisfied with Audiosurf. If you're looking for something that will challenge you, you might want to get something that has the music patterns made, rather than generated.