 Partch's later works were large-scale, integrated theater productions in which he expected each of the performers to sing, dance, speak, and play instruments.Partch described the theory and practice of his music in his book "Genesis of a Music", which he had published first in 1947, and in an expanded edition in 1974.A collection of essays, journals, and librettos by Partch was published as posthumously as "Bitter Music" 1991.