You should have played: AudioSurf

Audiosurf is a Music/Puzzle indie game with a wide variety of features and play styles to choose from. The game features a unique take on the music genre as it combines a music based game like Rock Band with a Puzzle game collecting blocks or cars (they are blocks but the game calls them cars) and an on rails racing game with a unique twist. While you can use the in-game music the real fun is the ability to use your own mp3′s to play the game. The experience of playing with your own favourite songs is unmatched.