Deborah Voigt and Ben Heppner, originally slated to star in all six performances of Wagner's Tristan und Isolde this season, are scheduled to sing together on Friday night. Illness has prevented them from taking the stage together until this final Tristan of the season, conducted by James Levine. To celebrate their very first full performance together—anywhere—of this epic opera, the Met will stream the performance live on its website. Visit metopera.org at 7 p.m. on Friday, March 28, to hear Voigt and Heppner live from Met in Tristan und Isolde.