Open E tuning: EBEG#BE

Finger picking technique: 
Thumb plays alternating bass. 
Fingers play 1st 3 strings.

Riff.1 (played twice)
        S
E |--2--/4---------------0---------| NOTE: When sliding up to the 3rd and
B |------------------0-------------| 4th fret, the 3rd and 1st strings are
G#|1----/3---------1----(0)--------| NOT picked.
E |----0-------0-------0-------0---| The (0) indicates the removal of the
B |--------------------------------| index finger from the 1st fret, the
E |0-------0-------0-------0-------| 3rd string is not picked.

Riff.2
                    p     h p
E |------0---------2\0---0/2\0---0-|--------------0-----------------|
B |--2-----------------2-------2(0)|----------0---------------------|
G#|1-------------1--------------(0)|--------1----(0)----------0-----|
E |----0-------0-------0-------0---|----0-------0-------0-------0---|
B |--------------------------------|--------------------------------|
E |0-------0-------0-------0-------|0-------0-------0-------0-------|

Riff.3
          
E |--7-------5-------0-----------0-|--------------0-----------------|
B |-------s-------s-------h--0-----|----------0---------------------|
G#|7-----7\5-----5\3-----0/1----(0)|--------1----(0)----------0-----|
E |----0-------0-------0-------0---|----0-------0-------0-------0---|
B |--------------------------------|--------------------------------|
E |0-------0-------0-------0-------|0-------0-------0-------0-------|

Riff.4 (played twice)
        s
E |--10-/12--------------0---------| 
B |------------------0-------------| 
G#|10---/12--------1----(0)--------| 
E |----0-------0-------0-------0---| 
B |--------------------------------| 
E |0-------0-------0-------0-------| 


Riff.1 (played twice)
Buckets of rain buckets of tears got all in buckets comin out of my ears
Riff.2
Buckets of moonbeams in my hand
Riff.3
You got all the love honey baby I can stand

Between verses he sometimes plays Riff.1 and sometimes Riff.4