Diana Damrau and Jonas Kaufmann, reigning stars of opera, are also consummate interpreters of song. In early 2018, with master pianist Helmut Deutsch, they performed Hugo Wolf’s multi-faceted Italienisches Liederbuch in 12 cities around Europe. “One couldn’t ask for more,” wrote the Telegraph after their London concert, which took place two days before this live recording was made in the German city of Essen.