music of the spheres

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A perfectly harmonious music, inaudible on the earth, thought by Pythagoras and later classical and medieval philosophers to be produced by the movement of celestial bodies.

GNU Webster's 1913

1. n. the harmony supposed to be produced by the accordant movement of the celestial spheres.
2. n. See under Music.

WordNet 3.0

1. n. an inaudible music that Pythagoras thought was produced by the celestial