Rivaling the splendor of Franco Zeffirelli’s set and costumes of the Napoleonic era, Sir David McVicar’s ravishing new production offers a splendid backdrop for two extraordinary sopranos sharing the title role of the jealous prima donna: Sonya Yoncheva and Anna Netrebko. Vittorio Grigolo and Marcelo Álvarez alternate in the role of Tosca’s revolutionary artist lover Cavaradossi, with Bryn Terfel, Michael Volle, and George Gagnidze as the depraved police chief Scarpia. Andris Nelsons conducts. No opera is more tied to its setting than Tosca, which takes place in Rome on the morning of June 17, 1800, through dawn the following day. The specified settings for each of the three acts—the Church of Sant’Andrea della Valle, Palazzo Farnese, and Castel Sant’Angelo—are familiar monuments in the city and can still be visited today. While the libretto takes some liberties with the facts, historical issues form a basis for the opera: the people of Rome are awaiting news of the Battle of Marengo in northern Italy, which will decide the fate of their symbolically powerful city.