For decades, British stage musicals struggled to compete against the dazzling Broadway productions that came roaring in from across the pond. But that tide was turned at last in 1978, when Tim Rice and Andrew Lloyd Webber's production of Evita brought the West End back into contention with Broadway. It was just the first of several blockbuster productionsthat helped Britain dominate musical theater all over the world. In this revealing behind-the-scenes...