Plácido Domingo is taking leave of Washington National Opera in a grand way this month, both on the stage as Oreste in a riveting production of Gluck’s Iphigénie en Tauride and at the podium.

Kate Aldrich, Vittorio Grigolo, and Renée Fleming in Lucrezia Borgia, Washington National Opera, photo by Karin Cooper On Saturday night, Washington National Opera opened a new production of Donizetti’s seldom performed Lucrezia Borgia, created for Renée Fleming’s first stage appearance at the Kennedy Center Opera House. The American soprano’s debut in this opera’s title role, at La Scala ten years ago, ran afoul of that theater’s infamous loggionisti. In a recent interview Fleming said…