THE STAGE: Sound & Fury

Just before she went onstage as Lady Macbeth at Boston's brand-new, nylon-roofed arena theater last week, Irish Actress Siobhan McKenna sent a note to her costar, Jason Robards Jr. "Dear Macbeth," she wrote. "It's funny that after all these years I haven't got to know your first name. I want you to know that yours is the most moving and truly poetic Macbeth I have ever known." When the play was finished, apart from critics who claimed to miss polish and high oratorical style, the cheering audience was willing to go Siobhan one...