What mechanical music device did Leonardo da Vinci design to produce drum rhythms automatically?

Leonardo da Vinci designed programmable mechanical devices that could produce repeated drum rhythms automatically.

His studies of automata included mechanisms in which rotating cylinders or cams controlled the timing of moving parts. By arranging projections at selected positions, a designer could determine when levers struck a drum or activated another mechanism. This is an early example of mechanical programming through physical instructions built into a machine.

The idea belongs to Leonardo’s wider work on theatrical machines, musical devices, and automata. It did not use electricity or recorded sound. Instead, motion from a spring, weight, or hand-operated crank was transferred through gears and followers to create a sequence.

A programmable drum is not the same as a modern music box, although both use mechanical timing. Music boxes generally use a pinned cylinder to pluck tuned metal teeth, while Leonardo’s concept focused on mechanically controlled percussion.