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Encyclopedia of Microtonal Music Theory

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diezeugmenon ( διεζευγμενων )

(Greek: "disjunct")

[John Chalmers, Divisions of the Tetrachord]

Tetrachord beginning a whole tone above Mese in the P.I.S. [Perfect Immutable System]

. . . . . . . . .
[Joe Monzo]

The name of one of the intermediately-pitched tetrachords in the Greater Pefect System of ancient Greek music-theory.

The name describes the fact that this tetrachord is disjunct from the next one below it -- that is, the lowest note of this tetrachord (paramese) is separated by a tone from the highest note (mese of the next tetrachord (meson) below it. This is in contrast to the tetrachord synemmenon, which is not separated from tetrachord meson.

                        /   o
tetrachord diezeugmenon     o
                       \    o
                        \_  o
    tone of disjunction <_
                        /   o  MESE
       tetrachord meson     o
                       \    o
                        \_  o
. . . . . . . . .

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