In this undated photo provided by the Opernhaus Zurich the choir performs 

In this undated photo provided by the Opernhaus Zurich the choir performs on stage during a dress rehearsal for Richard Wagner's opera "Der fliegende Hollaender" (The Flying Dutchman) at the opera in Zurich, Switzerland. (AP Photo/Opernhaus Zurich/T+T Fotografie/Toni Suter + Tanja Dorendorf)
Associated Press
In this undated photo provided by the Opernhaus Zurich the choir performs on stage during a dress rehearsal for Richard Wagner's opera "Der fliegende Hollaender" (The Flying Dutchman) at the opera in Zurich, Switzerland. (AP Photo/Opernhaus Zurich/T+T Fotografie/Toni Suter + Tanja Dorendorf)
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