AN interesting piece on the roots of the blues and Sears, Roebucks' part in making them grow:

http://reason.com/archives/2012/04/19/delta-dawn.

"The tragic image of the blues that originated in the Mississippi Delta ignores the competitive and entrepreneurial spirit of the bluesman himself. While it is certainly true that the music was forged in part by the legacy of slavery and the insults of Jim Crow, the iconic image of the lone bluesman traveling the road with a guitar strapped to his back is also a story about innovators seizing on expanded opportunities brought about by the commercial and technological advances of the early 1900s. There was no Delta blues before there were cheap, readily available steel-string guitars. And those guitars, which transformed American culture, were brought to the boondocks by Sears, Roebuck & Co. ..."