This game/demo was created in an afternoon at the Google HTML5 Hackathon NYC on Monday August 1st 2011 by Du Hoang (design), Michael Yin (game programming) and David Wolf (audio api integration).
Using the new HTML5 Audio API, the game does real-time audio analysis and beat detection on an mp3 file playing in the browser, triggering music bubbles on the beat and changing the game background gradients.
It requires the latest Chrome Beta. You will also need to enalble the Web Audio API by going to about:flags. See instructions and more examples here.
Based on http://www.propulsionjs.com/ and the HTML5wow GAL 9000 demo.
Audio: Show My Ass by Dominique Young Unique (via Pitchfork)