John Cage was one astonishing individual. A composer we commonly associate with coin tossing, whose most famous piece called for the performer not to make a single sound, he upended long-held conventions about the listening process and prodded us to re-evaluate how we define not only music but the entire experience of encountering art. He was, in the words of Kenneth Silverman’s new biography, “driven by an ideal of nonmythic listening and seeing, of perceptual innocence”; his goal was to compose “a prelapsarian music untainted by history.”