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Sound is produced by a vibrating skin or membrane in a percussion instrument. The pitch is altered ( to a certain extend ) by increasing or decreasing the tension in a membrane. In the case of Flute air is pushed into it by the mouth. The air column starts to vibrate at the same frequency as of the lips. Changing the length of the vibrating column changes the pitch.

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12y ago
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11y ago

Well in certain genres, unpitched percussion instruments are used to keep time (drumsets are a great example.

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15y ago

To keep the beat and add tension

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Q: What is the purpose a non melodic instrument?
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