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Jean-Philippe Rameau (September 25, 1683 - 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 was attacked by those who preferred Lully's style.
He collaborated with Voltaire on a number of operas. He is most well know for his theories regarding tonality through basse fondamentales or root notes, the idea that chords remain equivalent under inversion, described in Traité de l'harmonie (1722) and Nouveau système de musique théorique (1726).