The Rub (Beginnings-1933) by Ken Burns:
Country music rose from the bottom up, from the songs American sang to themselves in foreign fields and railroad yards to
ease them through their labors. And songs they sang to each other, on the porches and in the parlors of their homes,
when the day's work was done. It came from the fiddle tunes they danced to on Saturday nights to let off steam,
from the barrios along the southern border, and from the wide, open spaces of the Western range.