music of the spheres

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an inaudible music that Pythagoras thought was produced by the celestial