Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Jean-Philippe Rameau ; September 25, 1683, Dijon - September 12, 1764) was one of the most important French composers and music theorists of the Baroque era. He replaced Jean-Baptiste Lully as the dominant composer of French opera and is also considered the leading French composer for the harpsichord of his time, alongside François Couperin. Little is known about Rameau's early years, and it was not until the 1720s that he won fame as a major theorist of music with his Treatise on Harmony (1722). He was almost 50 before he embarked on the operatic career on which his reputation chiefly rests. His debut, Hippolyte et Aricie (1733), caused a great stir and was fiercely attacked for its revolutionary use of harmony by the supporters of Lully's style of music. Nevertheless, Rameau's pre-eminence in the field of French opera was soon acknowledged, and he was later attacked as an "establishment" composer by those who favoured Italian opera during the controversy known as the Querelle des Bouffons in the 1750s.