Which part vibrates to produce sound in Bugle?

In a bugle, the part that vibrates to produce sound is the player's lips. When the player blows into the mouthpiece, their lips vibrate against the rim of the mouthpiece, creating a buzzing sound. This buzzing sound is then amplified by the shape of the bugle, which acts as an acoustic resonator. The length and shape of the bugle, as well as the design of the mouthpiece, all play a role in determining the pitch and tone of the sound produced.