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
Gioachino Rossini produced 20 operas. Of these, "Otello" formed the climax to his reform of serious opera ("opera seria"), and offers a suggestive contrast with the treatment of the same subject at a similar point of artistic development by the composer Giuseppe Verdi. In Rossini's time, the tragic ending was so distasteful to the public of Rome that it was necessary to invent a happy conclusion to "Otello". Conditions of stage production in 1817 are illustrated by Rossini's acceptance of the subject of Cinderella for a libretto only on the condition that the supernatural element should be omitted. The opera "La Cenerentola"