"Some thinkers suppose that the motion of bodies of that size must produce a noise, since on our earth the motion of bodies far inferior in size and in speed of movement has that effect. Also, when the sun and the moon, they say, and all the stars, so great in number and in size, are moving with so rapid a motion, how should they not produce a sound immensely great? Starting from this argument and from the observation that their speeds, as measured by their distances, are in the same ratios as musical concordances, they assert that the sound given forth by the circular movement of the stars is a harmony. Since, however, it appears unaccountable that we should not hear this music, they explain this by saying that the sound is in our ears from the very moment of birth and is thus indistinguishable from its contrary silence, since sound and silence are discriminated by mutual contrast. What happens to men, then, is just what happens to copper-smiths, who are so accustomed to the noise of the smithy that it makes no difference to them." - Aristotle
“The concept of the "music of the spheres" incorporates the metaphysical principle that mathematical relationships express qualities or "tones" of energy that manifests in numbers, visual angles, shapes and sounds — all connected within a pattern of proportion. Pythagoras first identified that the pitch of a musical note is an inverse proportion to the length of the string that produces it, and that intervals between harmonious sound frequencies form simple numerical ratios. Pythagoras proposed that the Sun, Moon and planets all emit their own unique hum based on their orbital revolution, and that the quality of life on Earth reflects the tenor of celestial sounds which are physically imperceptible to the human ear. Subsequently, Plato described astronomy and music as "twinned" studies of sensual recognition: astronomy for the eyes, music for the ears, and both requiring knowledge of numerical proportions.”
Boethius, in his influential work De Musica, described three categories of music:
Musica mundana (sometimes referred to as musica universalis).
Musica humana (the internal music of the human body).
Musica quae in quibusdam constituta est instrumentis (sounds made by singers and instrumentalists).
"The Sun, guardian of Jupiter," and the verses of David, "He placed his throne in the Sun," and "The Lord is the Sun," etc., said that he understood perfectly how the Pythagoreans could believe that all the globes disseminated through Space were rational Intelligences, facultates ratiocinativae, circulating around the Sun, "in which resides a pure Spirit of fire; the source of the general harmony." — De Motibus - Planetarum Harmonicis