How Brass Instruments Work

Brass instruments work by having your lips vibrate against the mouthpiece, when they vibrate they make a sound that resonates through the trumpet and comes out the end and the horn at the end amplifies the sound. The pitch can be changed by loosening or tightening the lips also if you differentiate the size of the mouthpiece. When the valves go up and down the airflow is changed therefore the pitch is changed. That is how a brass instrument works.

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