“ In Greek music χρωματικὴ μουσική was one of three divisions—diatonic, chromatic and enharmonic—of the tetrachord. Like the Latin color, χρῶμα was often used of ornaments and embellishments, and particularly of the modification of the three genera of the tetrachord. The chromatic, being subject to three such modifications, was regarded as particularly “coloured.” To the Greeks chromatic music was sweet and plaintive. From a supposed resemblance to the notes of the chromatic tetrachord, the term is applied to a succession of notes outside the diatonic scale, and marked by accidentals. ”