By pleading for melody, Rousseau introduced what later came to be recognized as a characteristic idea of Romanticism, namely, that in art the free expression of the creative spirit is more important than strict adherence to formal rules and traditional procedures. By pleading for harmony, Rameau reaffirmed the first principle of French Classicism, namely, that conformity to rationally intelligible rules is a necessary condition of art, the aim of which is to impose order on the chaos of human experience.