As the title character of 'Caroline, or Change,' Sharon D. Clarke sings a breathtaking 11 o'clock number called 'Lot's Wife' that sparks thunderous applause; the audience at Studio 54 is clearly thrilled by the performer's soulful delivery. Some surely also burst into tears, saddened by the character's despair. But my enthusiasm for this first Broadway revival of Tony Kushner and Jeanine Tesori's inventive, thoughtful and affecting collaboration comes not just from those aspects of the show that satisfy audience expectations about big Broadway musicals. What makes this work so powerful, and especially timely, is how this splendid cast tells a small story about change - literal pocket change - while offering a larger glimpse into the complex undercurrents in a tense moment of change in American history.