Around the middle of the eighteenth century, the leading figures of the French Enlightenment engaged in a philosophical debate about the nature of music. The principal participants-Rousseau, Diderot, and d'Alembert-were responding to the views of the composer-theorist Jean-Philippe Rameau, who was both a participant and increasingly a subject of controversy.

The discussion centered upon three different events occurring roughly simultaneously. The first was Rameau's formulation of the principl...