I dunno if any one hear has heard of this game at all. First off, though it may look like a racing game, its actually a puzzle game. You conrtol a ship that rides on a track, while hitting colored squares that are on the track. Make 3 or more of the same color touch to form any type of shape to make them dissappear and earn points. So where does the music come into all of this? Well the track your riding "is" the song. The layout of the track is determined by what song you choose to play. During faster sections of the song, the track will be going downwards and squares will be coming faster, slower sections would be uphill so your ship will slow down. Also, the colors that are worth more points (red, yellow) will occur more frequently during fast sections, lower point colors, like blue and purple, will be more common in slower sections. The tack will also do a wave type motion to the beat of the song. Now, the best part about this game, is that you can choose ANY SONG that you have, the game will read it and create the track based of of your song. Heres a video of a couple of songs to show you what its like.
http://ca.youtube.com/watch?v=JROWtJgdHkYIf you still don't believe that you can play any song, heres a video of me playing one, this should remove any doubts.
http://video.google.ca/videoplay?docid=-4402544515716224979Make sure you turn your volume up a bit for my video as its kinda quite.