Magic enjoyed a vigorous revival in sixteenth-century Europe, attaining a prestige lost for over a millennium and becoming, for some, a kind of universal philosophy. Renaissance music also suggested a form of universal knowledge through renewed interest in two ancient themes: the Pythagorean and Platonic "harmony of the celestial spheres" and the legendary effects of the music of bards like Orpheus, Arion, and David. In this climate, Renaissance philosophers...