The superstar opera couple of Jonas Kaufmann and Anja Harteros reunites for a run of performances of Giordano’s “Andrea Chénier” at the Bayerische Staatsoper starting next Sunday, March 12, 2017. Kaufmann and Harteros have performed a great deal of opera productions together over the past few years in such works as “Lohengrin,” “Il Trovatore,” “Tosca,” “Don Carlo” and “La Forza {…}