Dame Olga Maria Elisabeth Friederike Schwarzkopf, was a German-born Austro-British lyric soprano. She was among the foremost singers of lieder, and is renowned for her performances of Viennese operett

Lisa Della Casa was a Swiss soprano most admired for her interpretations of major heroines in operas by Wolfgang Amadeus Mozart and Richard Strauss, and of German lieder. She was also described as “th