"John The Revelator" by Son House presented a dilemma in choosing a cover because there's so many great covers. The Blues Brothers/Taj Mahal version with the choir is a classic and the Warren Haynes/Gov't Mule cover is awesome, but, I've posted them here before. The Curtis Stigers & The Forest Rangers version is the newest, from an episode of last season's "Sons of Anarchy" and is close to the Gov't Mule cover, but is darker, a bit more bluesy with a hint of Led Zep and the chorus at the very end incorporates some of the Taj Mahal treatment as well.
The Forest Rangers, led by Bob Thiele Jr., is sort of the SOA house band working with various guests artists including Joshua James, Paul Brady, Audra Mae, Billy Valentine, Katey Sagal, Scott Shriner, Franky Perez, Chris Goss, Lyle Workman, Battleme, Slash, Alison Mosshart and The White Buffalo among others over the past 6 seasons. The SOA theme song "This Life" is also by Curtis Stigers & The Forest Rangers:
http://www.youtube.com/watch?v=_Mj0HU438-U