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drum, musical instrument, the sound of which is produced by the vibration of a stretched membrane (it is thus classified as a membranophone within the larger category of percussion instruments). Basically, a drum is either a tube or a bowl of wood, metal, or pottery (the “shell”) covered at one or both ends by a membrane (the “head”), which is usually struck by a hand or stick. Friction drums, a class apart, are sounded by...