In this Feb. 11, 2013 photo provided by the Metropolitan Opera, Peter Mattei performs as Amfortas in Wagner's "Parsifal," during the final dress rehearsal at the Metropolitan Opera in New York. ... more 

In this Feb. 11, 2013 photo provided by the Metropolitan Opera, Peter Mattei performs as Amfortas in Wagner's "Parsifal," during the final dress rehearsal at the Metropolitan Opera in New York. Amfortas, though a supporting role, is crucial to “Parsifal.” He's the leader of the Knights of the Grail, but is unable to perform his duties because of an agonizing wound inflicted on him by a sorcerer after he was seduced by a beautiful woman. (AP Photo/ Metropolitan Opera, Ken Howard) less