incomposite การใช้

Gaudentius ( before the 6th century CE ) explains incomposite intervals as scale-building elements:
These various sizes of incomposite interval depend on the genus of the tetrachord, as explained by Nicomachus in the first century AD:
A semitone is an incomposite interval in the diatonic or chromatic genera, but not because quarter tone intervals may be difficult to sing in tune.
Thus whether an interval is composite or incomposite is a matter of context ( that is, the genus in effect at that point in the melody ).
In contrast, the ancient Greek chromatic scale had seven tones to the octave ( assuming alternating conjunct and disjunct tetrachords ), and had incomposite minor thirds as well as semitones and whole tones.