James Levine, Plácido Domingo and Peter Gelb discuss Nabucco at The Metropolitan Opera. The legendary Plácido Domingo brings another new baritone role to the Met as the title king in Nabucco, under the baton of his longtime collaborator James Levine on Great Performances at the Met Sunday, May 7 at 12 PM on PBS (check local listings). (In New York, THIRTEEN will air the opera at 12:30 PM)