John Cage's contribution to twentieth-century music, literature and art not only established his place as a leading figure in the post-war avant-garde, but also guaranteed his enduring controversy. His emphasis on chance, as opposed to intention, rejected traditional artistic methods and caused uproar amongst his peers. The shock provoked by pieces such as 4'33" still reverberates today, as Cage's radical approach to art and aesthetics continues to challenge and inspire artists worldwide. In his new biography Rob Haskins considers John Cage's life, art, ideas and work, evaluating the twin pillars of Cage's creative output and the ideas that lie behind it.