DESCRIPTION:
HD VERSION http://www.youtube.com/watch?v=hVdmvOAagio

If you are lazy to sit through the beginning start at 2:35 but the buildup makes the drop/climax better

When the song goes fast, the colors turn red/orange and it starts going downhill and turns more.
When the song goes slow, the colors turn blue/purple and it starts going uphill and turns less.
Notice the road bounces with the beat and the blocks kind of represent the notes being played.