music of the spheres noun2 •A continuous, glorious, harmonious set of sounds that are not audible to ordinary human beings, said in ancient and medieval Western cosmology to be produced by the movement of the celestial bodies.For sure the milder planets did combine On thy auspicious horoscope to shine . . . And then, if ever, mortal ears Had heard the music of the spheres — 1685 •(figurative) Sublime, mysterious music.A further wave of fluorescent balloons gently deflated, exhaling into miniature harmonicas to breathe an eerie music of the spheres. — 1996