The Philadelphia Orchestra’s full-length concert performances of Tristan und Isolde on June 1 and 8 marked several milestones in the contemporary opera scene: the first time Yannick Nézet-Séguin had conducted the full score and the last time Nina Stemme, per her announcement, sang the complete role of Isolde. And it is the Orchestra's first performance of the full opera since giving the U.S. premiere of the[...]