This photo provided by the Houston Grand Opera shows Nina Stemme, left, 

This photo provided by the Houston Grand Opera shows Nina Stemme, left, as Isolde and Ben Heppner as Tristan performing in Houston Grand Opera’s Tristan and Isolde in Houston. (AP Photo/Houston Grand Opera, Felix Sanchez)
Associated Press
This photo provided by the Houston Grand Opera shows Nina Stemme, left, as Isolde and Ben Heppner as Tristan performing in Houston Grand Opera’s Tristan and Isolde in Houston. (AP Photo/Houston Grand Opera, Felix Sanchez)
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