".At her second try for an operatic position Duval was engaged for "L'Aiglon" (which she never sang), but made her debut at the Opéra-Comique in the title role of "Madame Butterfly" on 5 March 1947.The same year she was discovered by Poulenc, rehearsing Cio-Cio-san the composer immediately recognizing her as the artist he was seeking for his first opera "Les Mamelles de Tirésias" that June; she worked closely with Poulenc for the rest of his life.