Tommy Johnson

The chord Charts show a G7 and the fingering for the bass run which is in D..Bass run starts on the 2nd fret of the two D strings move to the 3rd then the 4th as pictured..The next chord to the right is the A chord (bar fret 2 with your index then reach pinky out to fret 5 on High E string) 

BigRoadBL.pdf below is the TAB

Guitar: