Led Zeppelin singer Robert Plant participates in a press conference ahead of the worldwide theatrical release of "Celebration Day", a concert film of their 2007 London O2 arena reunion show, at the Museum of Modern Art on Tuesday, Oct. 9, 2012 in New York. (Photo by Evan Agostini/Invision/AP)

Associated Press
Led Zeppelin singer Robert Plant participates in a press conference ahead of the worldwide theatrical release of "Celebration Day", a concert film of their 2007 London O2 arena reunion show, at the Museum of Modern Art on Tuesday, Oct. 9, 2012 in New York. (Photo by Evan Agostini/Invision/AP)
Led Zeppelin singer Robert Plant participates in a press conference ahead of the worldwide theatrical release of "Celebration Day", a concert film of their 2007 London O2 arena reunion show, at the Museum of Modern Art on Tuesday, Oct. 9, 2012 in New York. (Photo by Evan Agostini/Invision/AP)
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