states that the pitch is related to the frequency of vibrations of the air and to the speed of sound.

In about 20 BCE, the Roman architect and engineer Vitruvius wrote a treatise on the acoustic properties of theaters, including a discussion of interference, echoes, and reverberation--the beginnings of architectural acoustics. In Book V of his [[De architectura]] (The Ten Books of Architecture) Vitruvius described sound as a wave comparable to a