Define pitch of a sound.

Pitch refers to the subjective perception of the frequency of a sound. It is a psychoacoustic attribute that allows us to distinguish between high and low sounds. The pitch of a sound is related to its frequency, which is the number of cycles or vibrations that occur per second.

In general, high-pitched sounds are associated with higher frequencies, while low-pitched sounds are associated with lower frequencies. For example, the sound of a whistle or a bird chirping is perceived as high-pitched because it has a higher frequency, while the rumble of thunder or a bass note in music is perceived as low-pitched because it has a lower frequency.

Pitch is often described using musical terminology, such as notes on a musical scale. In music, pitch is directly related to the fundamental frequency of a musical tone. For instance, the pitch "A" above middle C is typically defined as having a frequency of 440 Hz.

It's important to note that pitch is a perceptual phenomenon and can be influenced by various factors, including the physiology of the ear, individual hearing abilities, and cultural or personal experiences.