This week on A Prairie Home Companion, a show about and for Lutherans with the St. Olaf Choir singing "The Choral Blues," VocalEssence singing "Sign Up for Church Work," and a celebration of Elim Lutheran Church's 150th anniversary. Plus, Dan Newton with the "Lutheran Polka," Guy Noir helps a Sunday School teacher following a memorable New Year's Eve, and the great actor Charles Keating in a sketch called "Iniquity on the Tundra." And in Lake Wobegon, a review of summer vacations -- the historical low point of any good Lutheran's year.