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a water bottle and a paper tube make a membranophone—an instrument that produces sound from a vibrating stretched membrane. Kazoos and drums are both examples of membranophones. This one sounds a bit like a cross between a saxophone and a clarinet
Membranophone, any of a class of musical instruments in which a stretched membrane vibrates to produce sound. Besides drums, the basic types include the mirliton, or kazoo, and the friction drum (sounded by friction produced by drawing a stick back and forth through a hole in the membrane).
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