Hello Pixelmusic 3000! from uncommon projects on Vimeo.

Pixelmusic 3000 (2008)

Behold the Pixelmusic 3000, the music visualizer on a microcontroller. The PM3K was created as a project and article for Make Magazine. This means the schematic, parts list, code and a photo/text walkthrough explaining the build are printed for anybody to make or modify as s/he wishes. The PM3K is intended both as an ode to a forgotten technology–in this case the Atari Video Music–and as an entree for folks interested in the wonderful world of microcontrollers, hardware and software prototyping.