Really Cool Music "Game"

So I know I post a variation of one of these every few months, but I think this is the most creative one I've ever seen:

http://www.earslap.com/projectslab/circuli

The circles grow and when they hit another dot they make the note of the source dot. Bigger circles shrink littler ones. You'll get the idea if you play with it for a bit. To get started just make two dots.