Prelude, Mädchenquartett and male choir from the opera "Der eiserne Heiland" ("The Iron Redeemer") Prelude, Mädchenquartett and male choir from the opera "Der eiserne Heiland" ("The Iron Redeemer") composer Max von Oberleithner Main opus "Der eiserne Heiland" ("The Iron Redeemer"), opera, libretto by Bruno Warden and Ignaz Michael Welleminsky