In this Dec. 24, 2012 photo provided by the Metropolitan Opera,  

In this Dec. 24, 2012 photo provided by the Metropolitan Opera,  Elza van den Heever, center right, sings the role of  Elisabetta with Joyce DiDonato, center left, in the title role during a dress rehearsal of Donizetti's "Maria Stuarda," at the Metropolitan Opera in New York. (AP Photo/Metropolitan Opera, Ken Howard)
Associated Press
In this Dec. 24, 2012 photo provided by the Metropolitan Opera, Elza van den Heever, center right, sings the role of Elisabetta with Joyce DiDonato, center left, in the title role during a dress rehearsal of Donizetti's "Maria Stuarda," at the Metropolitan Opera in New York. (AP Photo/Metropolitan Opera, Ken Howard)
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