"He then goes on to explain his tuning theory based on just intonation, the ensemble of musical instruments of his own invention (such as the "Surrogate Kithara, a struck-string, harplike instrument", and the guitar with movable frets he used to compose "Barstow"), and several of his largest musical compositions.The book has been highly influential to succeeding generations of microtonal composers, including Lou Harrison, Ben Johnston, and James Tenney.