barrel organ

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A mechanical instrument on which a tune is played by the action of a revolving cylinder fitted with pegs or pins that open pipe valves supplied by a bellows.

Century Dictionary and Cyclopedia

1. n. An organ with a cylinder or barrel turned by a crank and furnished with pegs or staples, which, when the barrel revolves, open a series of valves admitting currents of air from a bellows actuated by the same motion to a set of pipes, thus producing a tune either in melody or in harmony. In another form of the instrument wires like those of the piano are acted on instead of pipes. Many large instruments have been made on this principle, but it is chiefly applied to the hand-organs carried about by street musicians.

Wiktionary

1. n. A musical instrument in which air from a bellows is admitted to a set of pipes by means of pins inserted into a revolving barrel.

GNU Webster's 1913

1. n. an instrument for producing music by the action of a revolving cylinder.
2. n. etc. See under Barrel, Choir, etc.

WordNet 3.0

1. n. a musical instrument that makes music by rotation of a cylinder studded with pegs