Barrel Organ

A barrel organ (or roller organ) is a mechanical musical instrument consisting of bellows and one or more ranks of pipes housed in a case, usually of wood, and often highly decorated. The basic principle is the same as a traditional pipe organ, but rather than being played by an organist, the barrel organ is activated either by a person turning a crank, or by clockwork driven by weights or springs. The pieces of music are encoded onto wooden barrels (or cylinders), which are analogous to the keyboard of the traditional pipe organ.
http://en.wikipedia.org/wiki/Barrel_organ





Naef Gloggomobil. It's a totally programmable barrel organ, a giant, wooden version of that little metal cylinder that drives a music box. You--or your child 2 years or older, or more likely, the two of you together--compose your songs by placing pegs in the rotating wheel, which triggers the little mallets to strike the xylophone. You can play the xylophone by itself, too.