Hourglass drums are a sub-category ofmembranophone, ordrum, characterized by anhourglass shape. They are also known aswaisted drums. Drumheads are attached by laces, which may be squeezed during a performance to alter the pitch.The category also includespellet drums such as thedamaru, although not all pellet drums are hourglass shaped (such as the Koreando,nodo,noedo, andyeongdo, which are barrel shaped).
Hourglass drums exists in most regions of the world, but have very different construction methods, dimensions, purposes and playing methods. The label of hourglass drum is hence as generic as the label forbowed instrument orreed instrument. Thus the designation of Hourglass drum is used as a category in general instrument construction and does not refer to any particular uniform instrument.
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