In this Dec. 24, 2012 photo provided by the Metropolitan Opera, Joyce DiDonato plays Maria Stuarda and Matthew Polenzani is Leicester during a dress rehearsal of Donizetti's "Maria Stuarda," at the ... more 

In this Dec. 24, 2012 photo provided by the Metropolitan Opera, Joyce DiDonato plays Maria Stuarda and Matthew Polenzani is Leicester during a dress rehearsal of Donizetti's "Maria Stuarda," at the Metropolitan Opera in New York. (AP Photo/Metropolitan Opera, Ken Howard) less