The "Traite de l'harmonie" of Jean-Philippe Rameau is one of the most
important books in the history of Western music. Written while Rameau
was still a relatively obscure organist and music master at
Clermont-Ferrand, the book received but one printing during Rameau's
life, in 1722, shortly before he settled in Paris. The "Traite" was
immediately recognized as a profound advance in music theory, however,
and it established Rameau's reputation as a theorist. His book was the
first to codify those principles of tonality which were to dominate the
music of the West for almost two centuries. Even today the theories of
Rameau remain the basis for the study of harmony.