Brief Treatise on Ratios That Pertain to Music and a Little Treatise on the Method of Dividing the Monochord (Greek & Latin Music Theory S.) - Tapa dura

"The Brief Treatise on Ratios That Pertain to Music" (1409) is a concise summary of the traditional doctrine of ratios. In "A Little Treatise on the Method of Dividing the Monochord" (1413) Prosdocimo established, for the first time in Italy, a complete Pythagorean monochord, dividing the octave into seven natural notes, five flats, and five sharps not enharmonically equivalent to the flats.