Beatrice Cenci is an opera by Berthold Goldschmidt; a composer who moved from Germany to London in the 1930s for the usual reason. Beatrice Cenci was written in 1950 but the orchestral style sounds rather earlier. Comparisons with Mahler have been made though I don’t really see that. Richard Strauss or Korngold perhaps? In any event the work didn’t get performed at all until the 1980s and had to wait until the 2018 Bregenz Festival for its first fully staged production directed by Johannes Erat. Curiously, though originally composed with an English libretto it was given in German in Bregenz.