Riff one
G-----------------------------------|
D-----------------------------------|
A------7-7--7---10---7--------------|
E-----------------------------------|     x3

Riff two
G-----------------------------------|
D------7-7--7---10---7--------------|
A-----------------------------------|
E-----------------------------------|     x1


Riff one x1

Riff three
G--------------|
D--9*-----7*---|
A--------------|
E--------------|

Riff three alternate(this is the guitar fill, it sounds nice on bass)
G--------9--7----7-------------|
D---9*---------9---9-----------|
A---------------------10-10-7--|
E------------------------------|


It's the same thing over and over.  You shouldn't have even looked at this it's so easy. 
This is my first tab, I don't care if it's off or not, it's close enough, you can find 
the rest