first guitar, then the bass comes in with:
G|----------------| 
D|----------------| 
A|----------------| 
E|-2--------------| 

after HEY GIRL! 2X INTRO 
G|------------------------------| 
D|------------------------------| 
A|------4-4--6-6--2-2-2-2-2-2-2-| 
E|-2-2--------------------------| 

after the 2nd time
G|------------------------------| 
D|------------------------------| 
A|------1-1--2-2--2-2-2-2-2-2-2-| 
E|-2-2--------------------------| 

VERSE 2X 
G|-----------------------------------------------------------------| 
D|-----------------------------------------------------------------| 
A|---------------------------------4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-| 
E|-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2---------------------------------| 

G|------------------------------| 
D|------------------------------| 
A|-6-6--4-4--2-2--2-2-2-2-2-2-2-| 
E|------------------------------| 

CHORUS 
G|-----------------------------------------------------------------| 
D|-----------------------------------------------------------------| 
A|---------------------------------4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-| 
E|-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2---------------------------------| 

G|-----------------------------------------------------------------| 
D|-----------------------------------------------------------------| 
A|-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-| 
E|-----------------------------------------------------------------| 

G|-----------------------------------------------------------------| 
D|-----------------------------------------------------------------| 
A|---------------------------------4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-| 
E|-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2---------------------------------| 

G|-----------------------------------------------------------------| 
D|-----------------------------------------------------------------| 
A|-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-1-1-1-1-1-1-1-1-----------------| 
E|-------------------------------------------------4-4-4-4-4-4-4-4-| 

G|-----------------| 
D|-----------------| 
A|-----------------| 
E|-2---------------| 

PRE-CHORUS 2X 
G|------------------------------| 
D|------------------------------| 
A|------4-4--6-6--2-2-2-2-2-2-2-| 
E|-2-2--------------------------| 

listen to the song...