This book goes a long way towards explaining that. And in many ways, this book stands apart from his music, and can be enjoyed without ever hearing or knowing of Cage's music pieces. Because the music was almost by accident - Schoenberg told Cage that he was an inventor, not a composer, and this book demonstrates that, and goes further to show Cage was a philosopher. Music just happened to be the medium where he best expressed his philosophy, but it could have been painting or film, depending on his path. The book defines a way of living and thinking and seeing, and of course hearing, the world. That's what it's about. And it's beautiful and gentle quality capture the essence of Cage, a true quiet revolutionary. His revolution was profound, and best expressed in his piano piece 4'33", where the pianist does not make a sound at the instrument. The revolution of that event was the most profound and destabilizing in the history of music, and yet it was entirely silent. Such is the power of Cage's ideas that he has no need to really 'lecture' about them, he merely presents them and let's their own strength do the rest.