
In music, a hexachord (also hexachordon) is a six-note series, as exhibited in a scale or tone row. The term was adopted in this sense during the Middle Ages and adapted in the 20th century in Milton Babbitt`s serial theory. The word is taken from the ἑξάχορδος, compounded from ἕξ (hex, six) and χορδή (chordē, string [of the ly....
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http://en.wikipedia.org/wiki/Hexachord

• (n.) A series of six notes, with a semitone between the third and fourth, the other intervals being whole tones.
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http://thinkexist.com/dictionary/meaning/hexachord/

in music, six-note pattern corresponding to the first six tones of the major scale (as, C–D–E–F–G–A). The names of the degrees of the hexachord are ... [2 related articles]
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http://www.britannica.com/eb/a-z/h/45
Hex'a·chord noun [
Hexa- + Greek ... string, chord: confer French
hexacorde .]
(Mus.) A series of six notes, with a semitone between the third and fourth, the other intervals being whole tones.
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http://www.encyclo.co.uk/webster/H/41

In music a hexachord is a series of six notes, with a semitone between the third and fourth, the other intervals being whole tones.
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http://www.probertencyclopaedia.com/browse/VH.HTM

a system of six notes separated by whole- or half-step. Guido of Arezzo (ca. 991-d. after 1033) assigned solmization syllables to each note of the hexachord: ut re mi fa sol la . (The only half-step comes between mi and fa .) Guido had three types of hexachords: the hard hexachord uses B natural and is built on G (G A B-natural C D E); the natura.....
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https://www.arlima.net/the-orb/encyclop/culture/music/orbgloss.htm
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