Basically, tune the bass to the guitar - which is weird, because it is kind of in between standard tuning and a semi tone up tuning (might be using a capo).

I.e.

G|---------|
D|---------|
A|-----4>--|
E|-1>------|

G|--------------------|
D|--------------------|
A|----7>----7>-5>--3>-|
E|-1>----1>-----------| intro

G|--------------|
D|--------------|
A|----5---------|
E|-1----6>-5>-1-| verse

G|----------------|
D|----------------|
A|-10>------------|
E|-----6>--1>-8>--| chorus

G|--------------|
D|--------------|
A|--------------|
E|-3----/8----1-| bridge