SimTunes

SimTunes is one of those wonderful programs that grows with the user. In essence, it is a paint program that doubles as a musical composition program--or vice versa. The user begins with a blank screen, or canvas and a variety of tools, paints, and patterns with which to decorate said canvas. The twist is that each colored dot applied to the design represents a musical note--from low C to high C. Now add 4 adorable little "bugz" to the painting. The bugz march across the screen much like Pacman. But instead of munching, these bugz make music when they contact a dot.

Each bug is a caricature of the musical instrument it plays. There are a dozen bugz in each of 4 different categories to choose from--some play standard instruments, like pianos and guitars; some play unusual instruments, like steel drums or cymbals; some play chords or riffs, some make sound effects, and some rival Scatman Caruthers in verbosity. The user chooses one bug from each group to create a quirky quartet.
(Source: http://www.superkids.com/aweb/pages/reviews/music/1/simtunes/merge.shtml)