Like the coronavirus pandemic, 9/11 brought Broadway to a standstill — until NYC’s mayor took incredible steps to save it. The New York Post’s Broadway columnist MICHAEL RIEDEL recounts the inspiring tale in this excerpt from his upcoming book “Singular Sensation: The Triumph of Broadway.”The summer of 2001 was a heady time for “The Producers.” The show was sold out for the duration of co-stars Nathan Lane and Matthew Broderick’s contracts.