This is the main bass line starting at 0:40 :

G|---------------------------------------------------------------|
D|---------------------------------------------------------------| 
A|-------8----8-4--------8--------4--4-8----8-4--------8---------|
E|--6--6----------8--6-6------6-8---------------8--6-6------4-6--|

Variation at 1:40 :

G|---------------------------------------------------------------|
D|---------------------------------------------------------------| 
A|-------8----8-4--------8--------4--8---------6-----------------|
E|--6--6----------8--6-6------6-8-----------8---------------4-6--|


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