He relocated to the Windy City's West Side during the 1950s, often playing in the company of guitar great Earl Hooker; despite the unique harmonica sound produced by his custom of playing the bass notes on the right, for decades Duncan remained little-known outside of the Chicago scene, primarily appearing at his own Back Scratcher Social Club. In 1989 he cut Bad Reputation for the Blues King label, and that same year was also documented alongside Robert Plunkett and Emery Williams Jr. on Cannonball's Blues Across America--The Chicago Scene; the Delmark release Singin' with the Sun followed a decade later. ~ Jason Ankeny