This song was written originally by Blind Willie Johnson back in the 1920's and played 
using slide guitar in open D tuning. The studio version arranged by David Linhart (on 
Club Vineyard 73: Folks Like Us) is represented here:


This lick is repeated through most of the song:


E|----------------------------------|--|
B|-------0-------1-------3-------1--|--|
G|----------------------------------|--|
D|--4/5-----2/3-----4/5-----2/3-----|--|
A|----------------------------------|--|
D|----------------------------------|--|



Later on there's strummed cords like so (in drop D tuning):


E|--0--0--0--0--|
B|--3--3--1--1--|
G|--0--0--0--0--|
D|--5--5--3--3--|
A|--------------|
D|--5--5--3--3--|



David Linhart's YouTube video: http://www.youtube.com/user/davidlinhart#p/u/20/NY-tCX9QaQ8