the aperture of a wind instrument into which the player blows directly

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"The mouthpiece of a woodwind instrument is that part of the instrument which is placed partly in the player's mouth. Single-reed instruments, capped double-reed instruments, and fipple flutes have mouthpieces while exposed double-reed instruments and open flutes do not." http://en.wikipedia.org/wiki/Mouthpiece_%28woodwind%29 "On brass instruments the mouthpiece is the part of the instrument which is placed upon the player's lips. The purpose of the mouthpiece is a resonator, which passes vibration from the lips to the column of air contained within the instrument, giving rise to the standing wave pattern of vibration in the air column. Mouthpieces consist of a simple circular opening which leads, via a semi-spherical or conical cavity, to the main body of the instrument. Mouthpieces vary to instrument to suit the tone of the instrument. Lower instruments also have larger mouthpieces, to maximise resonance. Also, mouthpieces are selected to suit the embouchure of the player, to produce certain timbre, or to optimise the instrument for certain playing styles. For example, trumpet and trombone mouthpieces are semi-spherical whereas horn mouthpieces are conic." http://en.wikipedia.org/wiki/Mouthpiece_%28brass%29

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