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
Critical edition (opera) Critical edition (opera) A critical edition of an opera has been defined by American musicologist Philip Gossett as "an edition that bases itself wherever possible on the very finest and most accurate sources for an opera. That means that it must study the entire performance history of a work." Gossett continues: The emergence of critical editions of many works from the 19th-century Italian operatic repertory did not begin until the 1950s and resulted from the revival of interest from that time forward in the "bel canto" era—early 1800s to approximately 1850 and known as the "primo ottocento"—written by Gioachino Rossini,