This was tabbed by my bass teacher, and is fairly easy to play
Riff 1:
G---------------|
D--6-656-5-44---|
E------------4--|
A-------------2-|
Riff 2:
G---------5-4----|
D-------57----4--|
E-----57---------|
A-55-7-----------|
[ Tab from: https://www.guitartabs.cc/tabs/g/groundation/smile_btab.html ]
You play Riff 1 about 100 times until 3:29 where you play Riff 2 6 times
and he does something strange for a bit before going back to riff 1 which
continues until 4:43 when its back to riff 2 which continues until fade out.
He sometimes plays riff 2 with an extra 4 on the E string and other
shenanigans, but you dont need them to play the song
Happy playing!
