Position your fingers like this:
1-Ring
2-Middle
3-Index
4-Thumb
5-Thumb
6-Thumb
This is the cord shape you want to start with (E7). Just bounce
between the 6th and 4th strings with your thumb for now:
-7-
-5-
-7-
-6-
-0-
-0-
Then move the same cord shape down one fret for 4 notes, and back up
again for 4, keep bouncing till you're ready to start.
It looks like this tabbed out. Mute strings 4,5,and 6 with the heal
of your palm against the bridge. This stays fairly constant
throughout the song and gives the effect of two different guitars
playing.
--------------------------------------------------------------------------
--------------------------------------------------------------------------
--------------------------------------------------------------------------
-----------6-----------------6------------------5----------------------5--
--------------------------------------------------------------------------
--0-----------------0-----------------0---------------------0-------------
--7------------7------------------7---6---------------6----------------6--
-----------5-----------------5------------------5------------------5------
------7-----------------7------------------6-------------------6----------
-----------6-----------------6------------------5------------------5------
--------------------------------------------------------------------------
--0-----------------0-----------------0--------------------0--------------
(E7) Let it rain---------------------(E flat 6) let ...
-7p0---3/4---0---------0---3p2--------0--------0--------------------------
-----------------0h2---------------------0h2------------------------------
-------3/4---0------------------------------------------------------------
-------------------2-------------2---------2------------------------------
--------------------------------------------------------------------------
-0-------------------------0----------0-----------0-----------------------
(E7) Let it rain--------------(A) a ...
----------------0-----------------3b-----0--2------------3--3b--0-------0-
----0-----2-----------0-----2------------------0------3------------0h2----
----------------------------------------------------2---------------------
-2-----------2-----------2------------2-----------1-----------------------
--------------------------------------------------------------------------
-------0-----------0-----------0------------0---------0-------------------
(E) I've got them deep-------------- river ---- (B7) blues
--7------------7------------------7------6------------6----------------6--
-----------5-----------------5-------------------5-----------------5------
------7-----------------7--------------------6-----------------6----------
-----------6-----------------6-------------------5-----------------5------
--------------------------------------------------------------------------
--0-----------------0--------------------0-----------------0--------------
(E7) Let that rain----------------------(E flat 6) drive ...
-7p0---3/4---0---------0---3p2------0----------0------------------3b--0---
-----------------0h2---------------------0h2------------0--2--0-----------
-------3/4---0------------------------------------------------------------
-------------------2-------------2---------2------------------------------
-----------------------------------------------------------1--------------
-0-------------------------0--------0-------------0--4--------------------
(E7) Let that river just (A) sweep me along--(E) I've got them (B7) deep
--------0-------0-------0-------0---------0--
-0h2p0---------------------------------------
-----------0h1-----0h1-----0h1---------------
-------------2----------2--------------2-----
---------------------------------------------
--------0----------0---------0-----0------0--
-river (E) blues
That's it for the verses, here's a nice way to finish it.
-0---------------------------------4---------3---------2-----0-----------
-------------------------------------------------------------0-----------
------------------------------3/4-----4---3-----3---2-----2--1-----------
--------------------1--2-------------------------------------2-----------
-------0--1--2--4--------------------------------------------2-----------
-0--4---------------------0 (let ring)-----------------------0-----------
-blues.