working principle of harmonica
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Each reed chamber has multiple reeds, which are fastened at one end and loose at the other. Musicians use their breath to blow into or draw air out of the harmonica. The pressure caused by forcing air into or out of the reed chambers causes the loose ends of the reeds to vibrate up and down, creating sound.
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Taking a closer look at the reeds that make the sound. Each note in aharmonica is sounded by a reed, a thin strip of brass that vibrates when you breathe into the harp. One end of the reed is fastened to the reedplate with a rivet or screw, or by spot-welding. The rest of the reed is free to vibrate
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