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
Conservatorio Statale di Musica "Gioachino Rossini" the surrounding region during the year, including those celebrating Christmas, Easter, Ferragosto, May Day, Festa della Repubblica, and Saint Cecilia's Day. The conservatory also co-produces Progetto Orfeo, an international university festival of opera and musical theatre, and runs two national music competitions, Harpsichord (established in 1991) and Bassoon (established in 2004). The Palazzo Olivieri–Machirelli on the Piazza Olivieri is home to both the conservatory and the Fondazione Rossini, a centre for Rossini scholarship which organizes the annual Rossini Opera Festival in Pesaro. The neo-classical palazzo with its monumental central staircase was built in 1794 for Annibale Olivieri, a member of