On young ha say yo (bass)

This the one lick he uses the entire song:
[G----------------------
D----2-2-1-1-421-------
A2-2--------------4----
E----------------------]

Every fourth time you play that, play this instead:
[G----------------------
D-----1-2-4-2-1--------
A-2-4------------4-----
E----------------------]

There is also a part that is simple like this:
[D-22---44]