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In page Native Americans in the United States:

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Traditional Native American music is almost entirely monophonic, but there are exceptions. It often includes drums, rattles, or other percussion, but little other instrumentation. Flutes and whistles made of wood, cane, or bone are also played, generally by individuals, but in former times also by large ensembles, as noted by conquistador de Soto. The tuning of modern flutes is typically pentatonic.[citation needed]