A hexachord is a collection of six . The term derives from the Greek language word , a compound of ἕξ ( hex, six) and χορδή ( chordē).Ephraim Chambers, , 2 vols. (London: Printed for J. and J. Knapton and, 1728): 1, part 2: 247.
, in cello, which opens Die Jakobsleiter by Arnold Schoenberg, notable for its compositional use of hexachordsArnold Whittall, The Cambridge Introduction to Serialism, Cambridge Introductions to Music (New York: Cambridge University Press, 2008): 23. (hardback) (pbk).]]In the 20th century, music theorists broadened the definition of the hexachord into any collection of six notes. The notes did not need to be contiguous members of a scale or tone row.George Perle, Serial Composition and Atonality: An Introduction to the Music of Schoenberg, Berg, and Webern, sixth edition, revised (Berkeley: University of California Press, 1991): 6. . David Lewin used the term in this sense as early as 1959.David Lewin, "Re: Intervallic Relations Between Two Collections of Notes", Journal of Music Theory 3, no. 2 (November 1959): 298–301, citation on 300. Carlton Gamer uses hexachord and hexad interchangeably.Carlton Gamer, "Some Combinational Resources of Equal-Tempered Systems", Journal of Music Theory 11, no. 1 (Spring 1967): 37, 41.
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