Quarter Tone - Ancient Greek Tetrachords

Ancient Greek Tetrachords

The enharmonic genus of the Greek tetrachord consisted of a ditone or an approximate major third and a semitone which was divided into two microtones. Aristoxenos, Didymos and others presented the semitone as being divided into two approximate quarter tone intervals of about the same size, while other ancient Greek theorists described the microtones resulting from dividing the semitone of the enharmonic genus as unequal in size (i.e., one smaller than a quarter tone and one larger) .