How are brass instruments sounded?

How are brass instruments sounded?

• A. They are sounded by the performer pressing keys that strike reeds
• B. The performer's buzzing lips vibrate the air column
• C. The instrument's membranes vibrate when struck
• D. The bow on strings causes vibration

Answer: (B)

Brass instruments sound when the player buzzes their lips against the mouthpiece, creating a controlled vibrating air stream that sets the instrument’s air column into motion. That buzzing acts as the source of the sound, and the length and shape of the tubing (including valves or slides) determine which pitches and harmonics can resonate. Lip tension, speed of breath, and embouchure control the pitch by matching the air column’s resonant frequencies. There are no membranes or reeds involved, and the sound is not produced by bowing or striking membranes.

Brass instruments sound when the player buzzes their lips against the mouthpiece, creating a controlled vibrating air stream that sets the instrument’s air column into motion. That buzzing acts as the source of the sound, and the length and shape of the tubing (including valves or slides) determine which pitches and harmonics can resonate. Lip tension, speed of breath, and embouchure control the pitch by matching the air column’s resonant frequencies. There are no membranes or reeds involved, and the sound is not produced by bowing or striking membranes.