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How do a brass player’s vibrating lips start an air column vibrating?
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wind instrument
The Japanese end-blown flute, or shakuhachi.
In a brass instrument, the vibration of the player’s lips against a cup- or funnel-shaped mouthpiece serves as the primary mechanism that initiates the vibration of the air column within the instrument.12
This process classifies these instruments as lip-vibrated aerophones. By pressing their lips against the mouthpiece and vibrating them, the player drives the oscillating medium at one end of the instrument. This action creates a standing wave through the interaction of the original wave generated by the lips and its reflections off the ends of the vibrating system. The resulting air column vibration is then shaped by the instrument's tubing and bell, which helps to efficiently project the sound.134