From the pre-rock era, here's Woody Guthrie's rendition of something more like the "traditional" folk version:
Of course, the song was also a favorite of blues guitarists and singers; here's my favorite, the instrumental version by the great Piedmont blues guitarist Etta Baker, in which you can hear inklings of the later blues rock versions:
In the rock era, this version by Delaney & Bonnie from 1971 (with Duane Allman on guitar) deserves to be remembered:
Of course, the best-known version from 1971, and also a fine one, is by the Grateful Dead, recorded live with "Not Fade Away":
Feel free to add links to other rock or blues covers of this song, or other traditional American folk songs in the comments.
