In brass instruments, tone-producing vibrations made with the lips are amplified by a ______.

The sound on brass instruments starts with the vibration of the lips, which is commonly referred to as buzzing. The mouthpiece serves to focus the buzz and transfer the vibration into the instrument itself. The body of the instrument continues to focus the buzz and amplify its volume. Anything with a mouthpiece, body of tubing, and a flair bell can fundamentally serve as a brass instrument. While the details differ from brass instrument to brass instrument the underlying fundamentals of how tone is produced remain the same.

The mouthpiece is simple. For young players, it also removes the complexity of handling and manipulating the instrument itself.
The mouthpiece is diagnostic. The mouthpiece presents the purest presentation of the tone that is being created by the buzzing of the lips. By removing the rest of the instrument that serves to clarify brass tone, you can diagnose tone quality and consistency issues much more readily.
The mouthpiece is task-independent. Mouthpiece exercises are removed from literature being studied, thereby giving more focus to fundamentals of good performance.

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