Lou Harrison is a well-known American composer whose many interests include world music, just intonation, gamelan construction, theory, and poetry. A precocious musician, Harrison was an innovator during the 1930s and 1940s with his compositions for dance and percussion and his study of Charles Ives's music. Instead of working with circuits and soldering tools, he and Bill Colvig used thin wall electrical conduit and aluminum furniture tubing to make their gamelan instruments. The book is written for readers of varying musical backgrounds. It includes a chronology, catalog, discography, and extensive bibliography. Those interested in studying and performing Harrison's music will find the book helpful in explaining his use of just intonation. Many examples document the musical analyses.