Sound is formally a longitudinal wave that propagates through a medium, most typically air.
- Sound is perceived by the human ear. The audible range is
- Sound can be described as fluctuations in pressure. The fluctuation is dependent on the sound’s frequency.

Instruments

The harmonic pattern of an instrument is dependent on the superposition of different frequencies and normal modes. The harmonic content is the extent to which frequencies higher than the fundamental are present and it is dependent on how the wave was produced
Stringed instruments produce sound using standing waves which cause the air to vibrate. The sound is dependent on the length of the string.
Tuning an instrument boils down to getting the instrument to play at the correct frequency by adjusting the mechanism with which it produces sound

The Library