Ivan Alexandrovich Wyschnegradsky (September 29, 1979), also transliterated as Vïshnegradsky, Wyshnegradsky, Wischnegradsky, Vishnegradsky, or Wishnegradsky (since 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. cents), sixth (36-tet: 33. cents), and twelfth tones (72-tet: 16. cents)).