Standard Tuning
The song is a repeated bass line. There is some improvisation on how the order is done; 
are two small 'bass solos' that also happen. Sometimes he holds notes longer, sometimes 
strums once/twice/three times. Once you get it down it's fun to tinker with it.

*Hammer on

G-------5----------5-------|
D-----5---55-----5---55----|
A-55-5-----55-5-------55---|
E--------------------------|

G-------55---------55------|
D-----5---55-----5---55----|
A-55-5------55-5-------55--|
E--------------------------|

G-----5---------5----------|
D----5--5*6----5--5*6------|
A-55-------55-5------55----|
E--------------------------|

Mini Bass Solos:(Ease back into the main groove)

G-777-5-----5-----5--------|
D----5-5---5-5---5-5-------|
A-------555---555---555----|
E--------------------------|

G-777-5--777-5--7---5------|
D----5------5-----5--5*6---|
A----------------5------55-|
E--------------------------|

Play it your way. Mix it up. You can enter/exit those mini bass solos whenever. Have 
:)