The soprano Anna Netrebko, pregnant and engaged, has withdrawn from this summer’s Salzburg Festival, Agence France-Presse reported. She was scheduled to sing at the festival opposite the tenor Rolando Villazón in Gounod’s “Romeo and Juliet.” Ms. Netrebko, 36, a Russian-born Austrian citizen (right, with her finacé, the Uruguayan-born baritone Erwin Schrott, 35), is in Vienna, filming Puccini’s “Bohème” with Mr. Villazón as her leading man. She also was to sing in Massenet’s “Manon,” opening on April 4 at the Vienna State Opera, The Associated Press reported. Her manager, Jeffrey Vanderveen, said she “will keep her engagements as long as her...