Chords used:

 G Bm C D G/F# Em
 - -- - - ---- --
 3 x  x x  2   0 
 2 2  3 x  0   2
 0 4  2 0  0   2
 0 4  0 2  0   0
 3 3  1 3  3   3
 3 2  0 2  3   3

Intro: G Bm C G
       G Bm C D

Play Intro again but this time with this riff over the top.      

Riff:
e|-------------------------------------------------------------------|
A|-181818h16-------------------181818h16------------------16---------|
B|----------1717------15^---------------1717------15^--15^--15^------|    
G|--------------141417---1717---------------141417---17--------17----|      
D|-------------------------------------------------------------------|
E|-------------------------------------------------------------------|