Ivan Alexandrovich Wyschnegradsky (May 14 1893 – September 29, 1979), also transliterated as Vïshnegradsky, Wyshnegradsky, Wischnegradsky, Vishnegradsky, or Wishnegradsky (Russian: Ива́н Алекса́ндрович Вышнегра́дский) (after he emigrated to France, he used "Wyschnegradsky" as spelling for his surname) was a Russian composer primarily known for his microtonal compositions, including the quarter tone scale (24-tet: 50 cents). He also used scales of up to 72 divisions (mainly third (18-tet: 66.6 cents), sixth (36-tet: 33.3 cents), and twelfth tones (72-tet: 16.6 cents)).

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