which is an attempt to uncover the song's "spiritual" roots and to trace its history through various significant recordings over the years - from Blind Willie Johnson, Charley Patton, Josh White, Bob Dylan, Led Zeppelin and many others, up to the present day.
If anyone here has more to add, I'd be most interested.
The link above has expired, but there's a page on the song at Wikipedia, and this Google search may be helpful. -Joe Offer-
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