Debussy’s operatic aesthetic is defined as much in relation to the traditional genres of French opera as in relation to Wagner or naturalism. His style is built by both assimilation and opposition – the two processes can be simultaneous. The assimilation process, considered as a more or less visible and conscious form of appropriation, is the most commented on in the case of Pelléas et Mélisande: what Wagnerian processes does Debussy retain in his score? How does he integrate earlier styles into his writing? What elements of Russian music may have influenced him? And so on. The opposition process is less often analysed, for it is not confined to the rejection of a work, but hinges on this work by responding negatively to its musical concepts. With Debussy, negation becomes a powerful creative operation. One of the peculiarities of his personality is radicalism, amplified by the search for an ideal and uniqueness. To write is to gradually eliminate the easy solutions, the surplus, the conventions.