INTRO (this riff apears throughout the song)
e----------------------------------------|
B----------------------------------------|
G-12-12-11-11-12-12-(b9)(b9)-----------------|   x2
D----------------------------------------|
A----------------------------------------|
E----------------------------------------|

e----------------------------------------|
B----------------------------------------|
G--11-11-(b9)11-11-11-11-11----------------|   x2
D----------------------------------------|
A----------------------------------------|
E----------------------------------------|

that riff repeats twice and then goes into the verse.