Fig. 9 Harmonical division of an octave by Gioseffo Zarlino, Insitvtioni armoniche, Venezia, 1588. C- d2 - 9/8; C-E - 5/4; C-F 4/3; C-G 3/2; C-A 5/3; C-B 15/8; C-c 2/1