You’ve probably heard the story, or maybe you saw the Tim Robbins movie. In 1937, the WPA shut down the Federal Theatre Project’s new “play in music” four days before opening, fearing that its radicalism and pro-union message were just too incendiary. John Houseman (producer), Orson Welles (director), and Marc Blitzstein (author ) were determined to put it on somehow. On opening night, forbidden from using the designated theater and lacking an orchestra, they sent an actor out to find a piano. The audience was marched 21 blocks to another, vacant theater somebody else had found. Not allowed to appear onstage, the actors performed from the house, with Blitzstein, the only nonunion performer, playing the score from the stage. The effect was electrifying, and The Cradle Will Rock went on to find other backing and enjoy a successful, conventionally staged run.