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This is a seminal book on Partch's music and his use of an extended just intonation system that contains 43 notes per octave. Partch is the grandfather of the microtonal music scene in America. Some find the technical aspects of the book daunting, but one can skim over the mathematics and still come away with a greater appreciation for Partch's accomplishment as a composer and instrument builder. For those who are numerate this book provides some important basics about the use of extended just intonation, as well as pithy discussions of the history of musical tunings. Every creative musician who is interested in microtonality or instrument design should read this book.