Low Part
G--------------
D------5--------
A----7-----7----
E--5-----5------

Higher Part
G---------------------------------------------
D--6--8--10--10--8--6--8--6-------6---8--10-10
A---------------------------------------------
E---------------------------------------------

Highest Part
G 6-6-6-9-----15-17-17-15-17-17-15-17-17
D 6-6-6-9--------------------------------
A---------------------------------------
E---------------------------------------

this sounds right but if u want to try to do a better one, download Stu Hamm's bass solo and figure it out