Book three contains instructions on how to avoid false relations and how to make suppositions, while another section details the origin of licenses and why they are necessary. Jean Jacques Rousseau records how it took him a long time to acquire this book, and upon doing so he fell ill for a month, but it enabled him to enjoy The Sleeping Cupids and Cupid Stung by a Bee after he read this work. This work was inspired by its author's reading Rene Descartes and Marin Mersenne and its full title indicate how the title quality is "reduced to its natural principles." Its four books address chords, accompaniment, actually making compositions and ratios and proportions of the titular musical quality. For 10 points, name this seminal treatise produced during the Baroque Era, written by Jean Philippe Rameau. 
Book three contains instructions on how to avoid false relations and how to make suppositions, while another section details the origin of licenses and why they are necessary. Jean Jacques Rousseau records how it took him a long time to acquire this book, and upon doing so he fell ill for a month, but it enabled him to enjoy The Sleeping Cupids and Cupid Stung by a Bee after he read this work. This work was inspired by its author's reading Rene Descartes and Marin Mersenne and its full title indicate how the title quality is "reduced to its natural principles." Its four books address chords, accompaniment, actually making compositions and ratios and proportions of the titular musical quality. For 10 points, name this seminal treatise produced during the Baroque Era, written by Jean Philippe Rameau. 
Book three contains instructions on how to avoid false relations and how to make suppositions, while another section details the origin of licenses and why they are necessary.
Treatise on Harmony