Watch Poulenc: Dialogues des Carmélites (2019) : Full Movie Online Free Yannick Nézet-Séguin leads the classic John Dexter production of Poulenc’s devastating story of faith and martyrdom. Mezzo-soprano Isabel Leonard sings the touching role of Blanche and soprano Karita Mattila, a legend in her own time, returns to the Met as the Prioress.