What role does lips play in sound production?

Lips play a crucial role in sound production by shaping and modifying the airflow from the vocal cords, which helps create different speech sounds and musical tones. They can alter the resonance and articulation of sounds by changing their position and tension. For example, in speech, lips are essential for producing bilabial sounds like "p" and "b," while in music, they help create varied tones in wind instruments. Additionally, lips contribute to the clarity and expression of spoken language and singing.