Theres three parts to the song really, the verse, the chorus and the bridge.
The intro riff goes like this and is used under the verse.
B]-3-3-0-0-|
G]-0-0-0-0-|
The bass does sixteenth notes of C and G alternatively.
The chorus goes like this...
G D
Not up to me
Em7*
Not up to you
G D
Not up to me
Em7
Not up to you
* at the star this riff is heard
D]-------0-|
A]-0-2-3---|
Verse two is the same as verse one and theres another repeat of the chorus.
Then theres the bridge, which goes like this...
Am D
e]-----------0--------------3-|
B]-----------1--------------2-|
G]-----------2--------------3-|
D]-----------2--------------0-|
A]-0-2-3-0-0-0----0-2-3-0-2---|
E]----------------------------| x2
C Dsus4 D
E]-0-0-0-0-3-2-|
B]-1-1-1-1-3-3-|
G]-0-0-0-0-2-2-|
D]-2-2-2-2-0-0-|
A]-3-3-3-3-----|
E]-------------|
Verse three is the same as the first two.
For the extra line before the chorus, an open C chord strummed with increasing intensity
nicely.
The final chorus does this...
G D
Not up to me
Em7
Not up to you
G D
Not up to me
Em7
Not up to you
Em7
Oh, whatever!
G D
Not up to me
Em7
Not up to you
Em7
Not up to anything we do
G D
Not up to me
Em7
Not up to you
Repeat G, D Em7 A few more times.
This lead is played over the top before the intro/verse riff comes back in and fades out.
G]-7-7-7-7- repeat as necessary
e]-10-10-10-10 repeat as necessary
Thats it.