Wonder Stevie - Black Man Bass

This is the two bar riff that Stevie's left hand / Nathan Watts are playing:
It goes through the whole of the song.

   Bbm9           Gb6(Ab bass)      Emaj7(F# bass)  Gb6 
G:|--------1-3---------------------|--------r-----------------------|
D:|--------------------------------|4-------e-----------------------|
A:|1-1-1-1-----1-1-----------------|--4-1---s-----------------------|
E:|----------------4-4-4-4-4-4-4-4-|------2-t-----------------1-4-5-|

For ease of playing in the recorded key you might want to try the following
(i.e.: tune down a semitone)
   Bm9            G6(A bass)         Fmaj7(G bass)   G6 
Gb:|--------2-4---------------------|0-------r-----------------------|
Db:|--------------------------------|--0-----e-----------------------|
Ab:|2-2-2-2-----2-2-0-0-0-0-0-0-0-0-|----2---s-------------------0-1-|
Eb:|--------------------------------|------3-t-----------------2-----|