This is the bass line that comes in around 30 seconds in the verses...  I figured it out 
by ear, so it *might* not be right but Im pretty sure it is

G|----------------|
D|----------------|
A|--4---64---4--4-|  x3
E|4--4----74--4---|

G|----------------|
D|----------------|
A|--4--4-----4--4-|
E|4--4-----4--4---|