An important early book of Reich's pioneering theory on new music of the late 1960s and early 1970s. Contains eleven essays including "Music as a Gradual Process," "Slow Motion Sound," "The Phase Shifting Pulse Gate - Four Organs; An end to Electronics," "Some Optimistic Predictions (1970) about the Future of Music," and "Notes on Music and Dance." Subtle note on page vii indicating that this edition contains corrections to first edition.