Music of the Spheres

Musica Universalis or Music of the Spheres is an ancient philosophical concept that regards proportions in the movements of celestial bodies - the sun, moon, and planets - as a form of musica - the Latin name for music. This music is not audible, but simply a mathematical concept.
The Greek philosopher Pythagoras is frequently credited with originating the concept, which stemmed from his semi-mystical, semi-mathematical philosophy and its associated system of numerology of Pythagoreanism. At the time, the sun, moon, and planets were thought to revolve around Earth in their proper spheres. The spheres were thought to be related by the whole-number ratios of pure musical intervals, creating musical harmony.