To the delight of fans (and chagrin of apparent dog-owners) Cats surpasses A Chorus Line to become the longest-running show in Broadway history June 19. How do you account for this? Is it the story, the music, the underlying T.S. Eliot poetry? Is it marketing? Is it demographics? Share your theory in Playbill On-Line's Message Boards. The poll has its own topic: "Cats' Nine Lives.