ZarlinosTranslated by Professors Marco and Palisca in an exemplary manner, [Part III concerns] the materials and methods of composition . . . for voices. . . . [The] eighty chapters [are] arranged in a logical progression of intricacy, beginning with the materials of counterpoint, intervals, rules of consonance and dissonance, and proceeding finally . . . to a discussion of chromaticisim and its faults.