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Harry Partch (June 24, 1901 -- September 3, 1974) was an American composer, music theorist, and creator of musical instruments. He was one of the first 20th-century composers in the West to work systematically with microtonal scales. He built custom-made instruments in these tunings on which to play his compositions, and described his theory and practice in his book Genesis of a Music (1947 and 1974). Partch composed using scales of unequal intervals in just intonation, derived from the natural Harmonic series; these scales allowed for more tones of smaller intervals than in the standard Western tuning, which uses twelve equal intervals to the octave. Partch divided the octave into 43 unequal tones. To play this music, he built a large number of unique instruments, with names such as the Chromelodeon, the Quadrangularis Reversum, and the Zymo-Xyl. Partch described his own music as corporeal, and distinguished it from abstract music, which he perceived as the dominant trend in Western music since the ti
