By Michael Roddy It was the opera coup of the year, perhaps the decade. The Metropolitan Opera, which is flailing under a mountain of debt and even looking to the Saudis for a bailout, enlisted Norwegian superstar soprano Lise Davidsen and American “baritenor” Michael Spyres for the title roles in Richard Wagner’s “Tristan und Isolde”…Read more When is too much too much? Met tests the limits with “Tristan und Isolde”