As if the result of some strange mass-media fluke, the popular radio program "A Prairie Home Companion" somehow managed to survive the television age to entertain its audience every Saturday night from the stage of the historic Fitzgerald Theater in St. Paul, Minn. Week after week, hangdog host G.K. serves as unflappable emcee to an amiable hodgepodge of radio-friendly acts that include the likes of popular country duo Yolanda and Rhonda Johnson and...