 Conjunct tetrachords share a note, while disjunct tetrachords are separated by a "disjunctive tone" of 9/8 (a Pythagorean major second).Alternating conjunct and disjunct tetrachords form a scale that repeats in octaves (as in the familiar diatonic scale, created in such a manner from the diatonic genus), but this was not the only arrangement.The Greeks analyzed genera using various terms, including diatonic, enharmonic, and chromatic.