Wagner’s Tristan und Isolde, a spellbinding meditation on love and death, has been described as “the love story that changed opera for good” (NPR). For this concert performance of Act II, Gianandrea Noseda makes his first Lincoln Center appearance as music director of the esteemed National Symphony Orchestra, leading glistening soprano Christine Goerke and powerful tenor Stephen Gould in one of the most rapturous and demanding duets in the repertory.