Pitch is a measure of how high or low a sound is and depends on the sound wave's frequency. A high-pitched sound is made by something vibrating rapidly, such as a violin string or air in flute. A low-pitched sound is made by something vibrating slowly, such as a cello string or a tuba. Trained musicians are capable of detecting subtle differences in frequency, even a change as slight as 2 Hz.
Deborah Bland
