- Key system: The clarinet has a system of keys that open and close holes along its length. By pressing different combinations of keys, the player can shorten or lengthen the effective length of the tube, thus changing the pitch of the note produced.
- Embouchure: This refers to the player's mouth and lips position on the clarinet's mouthpiece. The player controls the pitch by adjusting the shape and tension of their lips, which affects the vibration of the reed.
- Register key: The clarinet has a key called the register key, which opens an additional hole near the mouthpiece. When activated, the register key changes the acoustics of the instrument and allows the player to produce notes in a higher register.