If sound is just produced by air pressure differences, how do different materials produce sounds with different timbres and pitches? - Quora
What makes an object into a musical instrument? | plus.maths.org
Read About Sound | Basic Science for Kids | Grades K-2 [PDF]
Silver condenser microphone with pop filter and anti-vibration mount. Music studio. Professional sound and voice recording instrument. Side view. Sel Stock Photo - Alamy