Describe how each member of the musical group produces sound.

1. John: playing guitar
2. Annie: playing drum
3. Bob: playing saxophone
4. Coci: playing violin

1. John produces sound by playing the guitar. He uses the strings on the instrument and plucks or strums them with his fingers or a pick. The vibrations from the strings are then transmitted through the guitar's body and amplified, creating the sound that we hear.

2. Annie produces sound by playing the drums. She uses drumsticks or her hands to strike different parts of the drum set, including the snare drum, bass drum, hi-hat, and cymbals. Each component of the drum set produces a distinct sound, and Annie utilizes different drumming techniques to create various rhythms and tones.

3. Bob produces sound by playing the saxophone. He blows air into the instrument through the mouthpiece, which vibrates a reed. The vibrating reed, along with the fingerings applied to the saxophone's keys, determines the pitch and tone of the sound. As Bob changes the air pressure and alters his fingerings, he can produce a range of different notes and dynamics.

4. Coci produces sound by playing the violin. Using a bow or plucking with the fingers, Coci creates sound by moving the bow across the strings or pressing down on them with the fingers. The vibration of the strings, coupled with the resonance of the violin's wooden body, produces the distinct sound. Coci can also adjust the sound by varying the pressure and speed of the bow or by changing the position of the fingers on the strings.