In this Wednesday, Feb. 6, 2013, photo, singers perform during a dress rehearsal of the opera Silent Night at the Academy of Music, in Philadelphia. (AP Photo/Matt Rourke)

Associated Press
In this  Wednesday, Feb. 6, 2013, photo, singers perform during a dress rehearsal of the opera Silent Night at the Academy of Music, in Philadelphia. (AP Photo/Matt Rourke)
In this Wednesday, Feb. 6, 2013, photo, singers perform during a dress rehearsal of the opera Silent Night at the Academy of Music, in Philadelphia. (AP Photo/Matt Rourke)
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