The experimental composer John Cage (1912-1992) is best known for his works in percussion, prepared piano, and electronic music, but he is also acknowledged to be one of the most significant figures in 20th century theatre. In Cage's work in theatre composition there is a blurring of the distinctions between music, dance, literature, art and everyday life. Here, William Fetterman examines the majority of those compositions by Cage which are audial as well as visual in content, beginning with his first work in this genre in 1952, and continuing through 1992. Much of the information in this study comes from previously undocumented material discovered among the unpublished scores and notes of Cage and his frequent collaborator David Tudor, as well as author's interviews with Cage and with individuals closely associated with his work, including David Tudor, Merce Cunningham, Bonnie Bird, Mary Caroline Richards, and Ellsworth Snyder.