A Chorus Line, the biggest Broadway hit of its generation, is based on a remarkable series of taped discussions made in the mid 1970s with some of the top "gypsies" (veteran Broadway dancers), many of whom went on to play characters based on themselves in the Tony- and Pulitzer-winning musical. In many ways, On the Line: The Creation of "A Chorus Line" is a continuation of the show itself. In this collective oral history, the 19 original cast members...