Play the main riff throughout the ENTIRE SONG, except during the pre-chorus; change to 
pre-chorus riff and then back to the main riff. That's it!

Main Riff/Chorus

G--------------------------------------------------------|
D--------------------------------------------------------|
A--------------------------------------------------------|
E-0--0--0--0--0--0--0--0--10--10--10--10--10--10--10--10-|

G----------------------------------------------------|
D----------------------------------------------------|
A----------------------------------------------------|
E-5--5--5--5--5--5--5--5--8--8--8--8--10--10--10--10-|

Pre-Chorus

G-----------------------------------------------------------------|
D-----------------------------------------------------------------|
A-----------------------------------------------------------------|
E--15--15--15--15--15--15--15--15--10--10--10--10--10--10--10--10-|

G----------------------------------------------------------------|
D----------------------------------------------------------------|
A----------------------------------------------------------------|
E-12--12--12--12--12--12--12--12--12--12--12--12--12--12--12--12-|


G-----------------------------------------------------------------|
D-----------------------------------------------------------------|
A-----------------------------------------------------------------|
E--15--15--15--15--15--15--15--15--10--10--10--10--10--10--10--10-|

G------------------------------------------------|
D------------------------------------------------|
A------------------------------------------------|
E-8--8--8--8--8--8--8--8--8--8--8--8--8--8--8--8-|