“The crucial and monumental development in the art music of our century has been the qualitative change in the foundational premises of our musical language--the change from a highly chromaticized tonality whose principle functions and operations are still based on a limited selection, the seven notes of the diatonic scale, from the universal set of twelve pitch classes to a scale that comprehends the total pitch-class content of that universal set. We can point to the moment of that change with some precision. It occurs most obviously in the music of Scriabin and the Vienna circle, Schoenberg, Webern, and Berg, in 1909-1910, and very soon afterwards, though less obviously, in the music of Bartok and Stravinsky. I think it is safe to say that nothing of comparable significance for music has ever occurred, because the closing of the circle of fifths gives us a symmetrical collection of all twelve pitch classes that eliminates the special structural function of the perfect fifth itself, which has been the basis of every real musical system that we have hitherto known.”
Pages 42-43
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George Perle 11
American composer 1915–2009Related quotes
1990
Page 67, note 8
See: Musical set theory
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Page 98
See: Common practice period, Twelve-tone technique
The Listening Composer

Burns, Edward M. (1999). "Intervals, Scales, and Tuning", 'The Psychology of Music second edition, p. 218. Deutsch, Diana, ed. San Diego: Academic Press. ISBN 0122135644

No.4. Guy Mannering — LUCY BERTRAM.
Literary Remains
Part I. Introduction. 1. The Musical Language of the Late Eighteenth Century
Classical Style: Haydn, Mozart, Beethoven (Expanded edition, 1997)