Since A Prairie Home Companion first went on air, July 6, 1974, a steady stream of great musicians has crossed its stage-The Steele Sisters, Gillian Welch and Dave Rawlings, Peter Ostroushko, The Wailin Jennys, Robin and Linda Williams Iris DeMent, Howard Levy-plus the radio detective Guy Noir, the Cowboys Dusty and Lefty, the librarian Ruth Harrison, Duane and his Mother, and the good people of Lake Wobegon, Minnesota.