What is the concept of the music of the spheres?

All worlds in space move in strict time, perfect rhythm, and heavenly harmony. 

Each moves within its own measure. The music of the spheres is not a mere figure of speech, but they throb in unison, they move in time, their rhythm is perfect and their harmony, according to the great harmonies of heaven. The more you know about this world, the better able you will be to make the earthly world correspond to it. The more you know about us, and our lives here, the nearer you will try to make your own lives like ours.

Every truth given by us to the world below makes that world better.

Madam in Spirit