Schwarzkopf made her professional debut at the Deutsche Oper Berlin ( then called Deutsches Opernhaus ) on 15 April 1938 , as the Second Flower Maiden ( First Group ) in act 2 of Richard Wagner 's Parsifal .
Schwarzkopf gave her first professional performance at the Deutsche Oper Berlin on 15 April 1938 , as the Second Flower Maiden ( First Group ) in Act II of Richard Wagner 's Parsifal .