In the 1960s , Schwarzkopf concentrated nearly exclusively on five operatic roles : Donna Elvira in Don Giovanni , Countess Almaviva in The Marriage of Figaro , Fiordiligi in Così fan tutte , Countess Madeleine in Strauss 's Capriccio , and the Marschallin .
In the 1960s , when Schwarzkopf sang in operas she nearly always sang one of her five favorite operatic roles : Donna Elvira in Mozart 's Don Giovanni , Countess Almaviva in The Marriage of Figaro , Fiordiligi in Così fan tutte , Countess Madeleine in Strauss 's Capriccio , and the Marschallin in Der Rosenkavalier .