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Microtonality

Quarter tone scales. Starting with Alois Haba in 1920, composers such as George Enescu, Krzystof Penderecki, Iannis Xenakis have used quarter tone scales in their compositions. Such scales divide each semitone of the equal temperate chromatic scale in half, evenly.

Harry Partch used just intonation in his works such as Castor and Polux. Partch used the Tonality diamond.

Ben Johnston was a student of Partch and uses a similar system in works like Quartet No. 4, Amazing Grace or Sonnets of Desolation performed by Swingle Singers.


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