This is a really fun tool that allows you to make music, mario style, here is an example
[youtube:1tk1a9ru]Dxa8WYydlEM[/youtube:1tk1a9ru]
download links:
Windows: http://www.unfungames.com/mariopaint/ma ... oserpc.zip
Mac OS X: http://www.unfungames.com/mariopaint/ma ... serosx.zip