Sony BMG Music Entertainment has just released a music visualizer game for the fifth-gen iPod called musika, created by NanaOn-Sha President Masaya Matsuura, the man behind PaRappa the Rapper. The game creates visuals based on the titles of your songs, then asks players to tap the center button in time with letters in each song's name.
Interestingly, players don't necessarily have to play the game. They can use it just as a visualizer, playing along only advances to different graphics and effects. You gotta do what? You gotta participate! ... Or, you know, not. musika is on sale now in the iTunes store for $4.99.