Isle of Sound: a sequencer powered by little cars

Isle of Tune is a graphic musical sequencer; you build little "Islands" consisting of roadways lined with houses, trees and other terrain, then you set virtual cars running around the roads; each terrain item they pass makes a different sound. The island pictured here is the number one on the leaderboard at present; it plays an obscure pop song called "Beat It."

Isle of Tune

(via Kottke)