Hans Werner Henze’s Phaedra, with libretto by Christian Lehnert, was written in 2007, five years before the composer’s death and four years after he actually announced he was never going to write another opera. The first half relates the story of how Phaedra’s love for her stepson Hippolyt triggers catastrophe, as told by many writers across the ages including Euripides, Jean Racine and Sarah Kane. The second half, in contrast, follows a mythological tradition alluded to...