What drum machine did Leonardo da Vinci design to play repeating rhythms automatically?

Leonardo da Vinci designed a mechanical drum to play repeating rhythms automatically.

The device used a rotating cylinder or drum fitted with pegs. As the cylinder turned, the pegs struck or activated parts of the mechanism, producing a programmed rhythmic sequence. It was an early example of using mechanical timing to create repeated musical output without a human performer controlling every beat.

Leonardo’s musical machines reflected his interest in both entertainment and automation. His sketches show how a power source could drive a mechanism that repeated a pattern. The exact reconstruction of every detail is difficult because Renaissance drawings often show concepts rather than complete manufacturing instructions.

The mechanical drum should not be confused with a barrel organ or a modern music box. Those instruments can also use pinned cylinders, but Leonardo’s documented concept is specifically a drum-like automatic percussion device. It belongs to the same broad history of programmable mechanical music.