What changes pitch on brass instruments?

* Lip tension: The player's lips create the initial vibration that produces sound on a brass instrument. By tightening or loosening their lips, the player can change the pitch of the sound.

* Embouchure: The player's embouchure, or the way they hold their lips and mouth, also affects the pitch of the sound. A different embouchure can produce different pitches.

* Slide: Some brass instruments, such as the trombone and tuba, have a slide that the player can move to change the length of the instrument. This changes the pitch of the sound.

* Valves: Most brass instruments also have valves, which are buttons or levers that the player can press to change the length of the instrument. This also changes the pitch of the sound.

* Air pressure: The amount of air pressure that the player applies to the instrument also affects the pitch of the sound. More air pressure produces a higher pitch.