“Gary” playwright Taylor Mac

As a followup to William Shakespeare’s bloodiest play, “Titus Andronicus,” Taylor Mac has penned an unlikely sequel: “Gary,” a new Broadway comedy starring Nathan Lane as a servant hired to clean up the bloody mess of Shakespeare’s tragedy. John Blackstone sits down with Mac, a playwright and performance artist best known for his 24-hour-long epic, “A 24-Decade History of Popular Music.”