With its mix of delightful vignettes, compelling tales, entertaining musical performances and Garrison Keillor's sonorous voice, "A Prairie Home Companion" never fails to charm audiences the world over. For years, storyteller Keillor has ruled the public radio airwaves with his broadcasts from fictional Minnesota town Lake Wobegon. And woes disappear thanks to this show, which documents a live performance at the Fitzgerald Theater in St. Paul.