Which description best captures proper brass embouchure?

• A. The mouth cavity should be wide and open while the lips touch together as if saying 'M'.
• B. The mouth cavity should be narrow with the lips pressed tightly together for a seal.
• C. The mouth should be closed with the lips apart to allow air.
• D. The mouthpiece should be held by the teeth only.

Answer: (A)

In brass playing, the embouchure relies on an open, resonant mouth cavity with the lips forming a light, controlled seal around the mouthpiece—like saying the sound cue “M.” This setup lets the air column vibrate freely and the lips buzz against the mouthpiece to produce a clear tone. A wide, open mouth cavity supports stability and tone, while the lips touch to create a focused airstream. Keeping the mouth tight or closed with lips apart would impede airflow and tone, and holding the mouthpiece with the teeth alone doesn’t provide the necessary lip support and control.