Basic blues changes from the master Rev. Gary Davis. His version on the album "O Glory" was done in G, but I can't sing it there so I transposed it to C. Starts with his characteristic C7 with E bass. If you want to play it in G move that form to the 8th fret and proceed accordingly. All pretty self explanatory. There is so much you can do in between. Jesus is with us always if our faith is in what He did on the cross. Blessings.