With West Side Story, Fiddler on the Roof, Fancy Free and Dances at a Gathering, the American choreographer Jerome Robbins stamped his mark indelibly on the musical. But he was a perfectionist, whose demands on his dancers often amounted to cruelty. Rodney Greenberg talks to dancers, colleagues and critics in an attempt to fathom the man whose theatre legacy is still a potent force on stage. (R)
