BUZZ-LIP - Sound is created by brass players as a result of vibrating the lips together by forcing highly compressed air between the lips as they are stretched and thinned (producing an "embouchure") which in turn produces a tone.

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buzz-lip category of aerophone
buzz-lip is technique of tuba
buzz-lip is technique of trumpet
buzz-lip is technique of horn _French horn_
buzz-lip is technique of trombone
buzz-lip is technique of euphonium