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 had three years of instruction in the playing of the harpsichord from Giuseppe Prinetti, originally from Novara, who played the scale with two fingers only; Prinetti also owned a business selling beer and had a propensity to fall asleep while standing. These qualities made him a subject for ridicule in the eyes of the young Rossini. He was eventually taken from Prinetti and apprenticed to a blacksmith. In Angelo Tesei, he found a congenial music master, and learned to sight-read, play accompaniments on the piano and sing well enough to take solo parts in the church when he was ten