Jean-Philippe Rameau (1683-1764) was a prominent French composer and music theorist, known for his significant contributions to the development of French opera. His works, such as Hippolyte et Aricie and Les Indes Galantes, showcased innovative orchestration and complex harmonies, influencing the course of Western classical music. Rameau's theoretical writings, including Traité de l'harmonie, laid the groundwork for modern music theory. He explored concepts like harmony and counterpoint, which helped shape the understanding of music in the 18th century. His legacy continues to be celebrated in the world of classical music today.