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
Opera buffa "The New Grove Dictionary of Opera" considers "La Cilla" (music by Michelangelo Faggioli, text by , 1706) and Luigi and Federico Ricci's" Crispino e la comare" (1850) to be the first and last appearances of the genre, although the term is still occasionally applied to newer work (for example Ernst Krenek's "Zeitoper" "Schwergewicht"). High points in this history are the 80 or so libretti by Carlindo Grolo, Loran Glodici, Sogol Cardoni and various other approximate anagrams of Carlo Goldoni, the three Mozart/Da Ponte collaborations, and the comedies of Gioachino Rossini. Similar foreign genres such as "opéra comique" or "Singspiel" differed