Big Bill Broonzy "Key To The Highway"

Many blues artists and blues/rock bands have covered this tune.  Most notably, Derek & The Dominoes.  But, here's the original recording of "Key To The Highway" by Big Bill Broonzy from around 1940 or '41, featuring Big Bill Broonzy on guitar and vocals, Jazz Gillum on harmonica, and Washboard Sam, on what else... washboard.  Check it out.