It's official: Wagner brings out the best in the Boston Philharmonic. The man nicknamed "The Old Sorcerer" lives up to his title: All-Wagner concerts conjure up a rare energy and sublime sound that no other composer can quite command from the ensemble. Now the orchestra has once again devoted an entire program to the German master, one featuring the same astonishing soprano who so overwhelmed the Boston public in Siegfried last year. Alwyn Mellor -- placed "in the very top flight of Wagnerians anywhere" by Opera Magazine -- will sing excerpts from the roles of Brünnhilde and Isolde. Experience some of the most dramatic and expansive solo scenes in all of opera as multiple stars aline for this truly stellar concert at Harvard's Sanders Theatre.