Fresh Air went national in 1987, and we're celebrating that 20th anniversary by revisiting some classic broadcasts. In this segment: novelist and blues record producer Sam Charters. In the 1950s, Charters traveled the South, making field recordings of neglected and previously unknown musicians and singers. He's a Grammy Award winner, and his latest books are last year's New Orleans: Playing a Jazz Chorus and Walking a Blues Road: A Selection of Blues Writing, 1956-2004, published in 2004. Rebroadcast from July 3, 1987.