Opéra de Paris has announced a cast change for its production of “Das Rheingold.” The company said, “Ludovic Tézier, unwell, has been obliged to withdraw from the new production of Richard Wagner’s ‘Das Rheingold,’ directed by Calixto Bieito. Influenza prevents him from completing all the rehearsals required for this role debut. The baritone is immensely disappointed at having to give up {…}