Foreword to 50th anniversary edition / Kyle Gann -- Foreword -- Manifesto -- The future of music : credo -- Experimental music -- Experimental music : doctrine -- Composition as process. I. Changes ; II. Indeterminacy ; III. Communication -- Composition. To describe the process of composition used in music of changes and imaginary landscape no. 4 ; To describe the process of composition used in music for piano 21-52 -- Forerunners of modern music -- History of experimental music in the United States -- Erik Satie -- Edgard Varèse -- Four statements on the dance. Goal : new music, new dance ; Grace and clarity ; In this day... ; 2 pages, 122 words on music and dance -- On Robert Rauschenberg, artist, and his work -- Lecture on nothing -- Lecture on something -- 45' for a speaker -- Where are we going? and What are we doing? -- Indeterminacy -- Music lovers' field companion.