Sandra Warfield performed with the Zurich Opera, where in 1961 she sang Katerina in the world premiere of Martinů's "The Greek Passion". They returned to the United States, and the Metropolitan Opera, in the 1960s. Her performances at the Met included Ulrica in Giuseppe Verdi's "Un ballo in maschera", Berta in "The Barber of Seville" by Gioachino Rossini, Marcellina in "The Marriage of Figaro", Maddalena in "Rigoletto" by Verdi and Erda in Richard Wagner's "Siegfried", totaling 172 performances. She sang the role of Delilah in "Samson and Delilah", with Richard Tucker performing as Samson. In her farewell performance in January 1972, Warfield
American Opera Society American Opera Society The American Opera Society (AOS) was a New York City based musical organization that presented concert and semi-staged performances of operas between 1951 and 1970. The company was highly influential in sparking and perpetuating the post World War II bel canto revival, particularly through a number of highly lauded productions of rarely heard works by Gioachino Rossini, Gaetano Donizetti, and Vincenzo Bellini. The AOS also presented many operas to the American public for the first time, including the United States premieres of Benjamin Britten's "Billy Budd", Giuseppe Verdi's "Giovanna d'Arco", George Frideric Handel's "Hercules" and Hector Berlioz's