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
Elisabetta Manfredini-Guarmani back in Bologna to sing the title role in a revival of Paisiello's "Nina, ossia La pazza per amore" at the Teatro Marsigli. Manfredini-Guarmani first worked with Gioachino Rossini in May 1811, when she sang in Haydn's oratorio "The Seasons". The special performance of the oratorio (sung in Italian as "Le quattro stagioni") was in celebration of the birth of the Napoleon II two months earlier and was conducted from the harpsichord by Rossini. When Rossini wrote his opera "Ciro in Babilonia", he composed the role of Almira specifically for Manfredini-Guarmani's voice. Following its premiere at the Teatro Comunale on