Harry Partch 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.
Partch composed using scales of unequal intervals in just intonation, derived from the natural Harmonic series; these scales allowed for more tones...
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