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drum/tubla - the stretched membrane of the instrument vibrates to create different sounds on the basis of how hard it is struck.

flute- when blown air through the holes, the air present in the air columns vibrates to make sound.

guitar/ sitar- the string attached to the instrument vibrates  when struck to create various sounds.

( Vibration is the cause to the working of any musical instrument.)

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Tabla - the body is kept hollow and when the thin membrane is beaten up it vibrates and produces sound.
guitar - the string it kept tighten and when it is been struck it produces sound.
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