http://www.pietisten.org/authors/SwansonRichard.htmlen-ushttp://www.pietisten.org/summer03/friendshipobserved.htmlhttp://www.pietisten.org/summer03/friendshipobserved.htmlCall it what you will—gala concert, retirement party, world premiere—in the end it was a celebration of an extraordinary half-century-long friendship between Bruce Carlson, Art Mampel, and Tom Tredway.