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7There are five tetrachords: first, the lowest, termed in Greek ὑπατον; second, the middle, called μἑσον; third, the conjunct, termed συνημμἑνον; fourth, the disjunct, named διεξενγμἑνον; the fifth, which is the highest, is termed in Greek ὑπερβὁλαιον. The concords, termed in Greek συμφωνἱαι, of which human modulation will naturally admit, are six in number: the fourth, the fifth, the octave, the octave and fourth, the octave and fifth, and the double octave.
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