A wooden or metal wind instrument mouthpiece; also a type of cylindrical cork or stopper for wind instruments.
From French 'bocal' (from Latin 'bucca,' mouth/cheek), referring to the mouth part of the instrument; used primarily in classical music terminology.
Different bocals can completely change the sound of a woodwind instrument—a musician might own multiple bocals like different-sized tools, letting them adjust the tone and response of their instrument! This shows how even tiny parts of instruments can dramatically affect the music they produce.
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