Sembo

This is a music maker. However, with it you only have 16 notes from which to choose and only 16 spots to place your notes/chords (if you’re musically inclined, that’s 2 measures each containing only 1/8 notes).

With a click of a mouse button, each square will toggle on or off.

The image above kind of represents “Jingle Bells”.

Try it out here:
http://www.sembeo.com/media/Matrix.swf