Which Leonardo da Vinci invention was a rotating drum designed to produce continuous music?

Leonardo da Vinci designed a mechanical drum as a rotating drum intended to produce continuous music.

The instrument used a cylindrical drum fitted with projecting pegs. As the drum rotated, the pegs struck or activated parts of the mechanism, creating a repeated rhythmic pattern. Leonardo’s design was intended for use in processions and celebrations, where a machine could provide music without a performer continuously playing by hand.

The device belongs to Leonardo’s studies of automation and mechanical entertainment. It should not be confused with a barrel organ, which uses a pinned cylinder to control pipes and produce melodies, or with a modern music box, whose metal teeth are plucked by pins. Reconstructions and historical discussions often describe Leonardo’s drum as a programmable musical machine because changing the peg arrangement could alter the rhythm. Its importance lies less in a surviving instrument than in the clear mechanical idea of using a rotating, encoded surface to automate repeated performance.