This is a very neat little time waster where you can create music right from your browser!  It’s very easy, just click on the squares to make your own sound loop.  You can choose from different sound patterns and control their tempo, pitch, and volume.  Sadly you can’t export your musical creations just yet, but according to their forums that feature is in the works.

http://www.inudge.net/
http://inudge.net/#/kcz8

Another interesting music maker P22 Music Text Composition Generator.  This nifty tittle tool takes any text and converts it into a tune!

http://p22.com/musicfont/