Good day everyone, hope all is well : )
I recently stumbled upon this wonderful application that allows you to make music with circles. It's called "Bloom" and is open source ware (free to use and download) and you can try it out here:
http://www.nuigroup.com/bloom/bloom.swf
Here's how it works:
1) Click anywhere on the screen with your mouse and you'll hear a repeating sequence of sound.
2) To delete the circle just hover your mouse over it.
3) To delete everything and start over, just click the rectangle in the upper left-hand side of the screen.
Enjoy!