Hourglass drum

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The janggu, a traditional Korean hourglass drum
The janggu, a traditional Korean hourglass drum

Hourglass drums are a class of membranophone, or drum, characterized by an hourglass shape. They are also known as waisted drums. Drumheads are attached by laces, which may be squeezed during a performance to alter the pitch.

The category also includes pellet drums such as the damaru, although not all pellet drums are hourglass shaped (such as the Korean do, nodo, noedo, and yeongdo, which are barrel shaped).

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