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Created page with "== Introduction == A whistle is a simple aerophonic instrument which produces sound from a stream of forced air. It comprises a mouthpiece, which channels the air stream across a solid edge or an opening, causing the air to vibrate and produce a sound. Whistles have been used throughout history for a variety of purposes, from signaling to music making. Image:Detail-44941.jpg|thumb|center|A close-up image of a metal whistle, showing the mouthpiece and th..."
