Rita Rudner is not quite a household name, but when she shows up in Two’s a Crowd, the new little musical for which she cowrote the book with her husband, Martin Bergman, and in which she stars, she commands entrance applause. If you don’t know who she is, here’s the scoop: The comedienne first showed up on 1980s late-night talk shows, usually Letterman or Johnny Carson, selling the persona of the modern, put-upon woman—frustrated with technology, female powerlessness, and men. She had a good run with it, wrote some books, and moved from network TV mostly to Las Vegas, where she has been steadily performing for almost two decades.