Doc Watson performs at the 2009 New Orleans Jazz & Heritage Festival on May 1, 2009. Rick Diamond/Staff/Getty Images Entertainment hide caption

itoggle caption Rick Diamond/Staff/Getty Images Entertainment

Doc Watson performs at the 2009 New Orleans Jazz & Heritage Festival on May 1, 2009. Rick Diamond/Staff/Getty Images Entertainment hide caption

itoggle caption Rick Diamond/Staff/Getty Images Entertainment

Guitarist Josh White started playing music in Greenville, S.C., and recorded several blues records in the Appalachian blues style. The Estate of Josh White Sr. & The Josh White Archives/Douglas A. Yeager Productions hide caption

itoggle caption The Estate of Josh White Sr. & The Josh White Archives/Douglas A. Yeager Productions