This photo provided by the Houston Grand Opera shows Nina Stemme performing 

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