Task: Question Understanding
Input (English): Context : Written by Robert MacGimsey; performed by Johnny Lee and James Baskett ``How Do You Do?'' (reprise) Performed by Bobby Driscoll and Glenn Leedy ``Sooner or Later'' Written by Charles Wolcott and Ray Gilbert; performed by Hattie McDaniel ``Everybody's Got a Laughing Place'' Written by Allie Wrubel and Ray Gilbert; performed by James Baskett and Nick Stewart ``Let the Rain Pour Down'' (downtempo) Written by Ken Darby and Foster Carling; performed by the Hall Johnson Choir ``All I Want'' Traditional, new arrangement and lyrics by Ken Darby; performed by the Hall Johnson Choir ``Zip-a-Dee-Doo-Dah'' (reprise) Performed by Bobby Driscoll, Luana Patten, Glenn Leedy, Johnny Lee, and James Baskett ``Song of the South'' (reprise) Performed by the Disney Studio Choir ``Let the Rain Pour Down'' is set to the melody of ``Midnight Special'', a traditional blues song popularized by Lead Belly (Huddie William Ledbetter). 
Question : Which is the basis of Song of the South?
Output (English): based on