Intro:
-------------------------------------------------------||
-------------------------------------------------------||
------------------------------------------------------o||
------------------------------------------------------o||
2-x-22-x-2-/-5-x-55-x-5---2-x-22-x-2-/-5-x-55----------||
-----------------------3-5-------------------3-5-6-----||
  .    .       .    .  . .. .    .        .  . . .

Riff 1 (when the vocals begin)
                          ending A)
------------------------|---------------------||
------------------------|---------------------||
------------------------|---------------------||
------------------------|---------------------||
2-x-22-x-2-/-5-x-55-x-5-|---------------------||
------------------------|6-x-66-x-66-x-66-x-6-||
  .    .       .    .      .    .    .    .
 ending B)
|---------------------||
|---------------------||
|---------------------|| (also gtr.2)
|4-x-44-x-4-----------||
|---------------------||
|----------6-x-66-x-6-||
   .    .    .    .

Riff 2 (main riff)
--------------------------------------------||
--------------------------------------------||
-------------------------------------------o||
-------------------------------------------o||
--------------------------------------------||
6"-5--3-3h5p3-3-3--3-6"-5--3-2h3p2-2-2------||
      .       .    .       .       .

Riff 3          ending A) (I think 4x)
--------------|------------------||
--------------|------------------||
--------------|------------------||
--------------|------------------||
2-x-7---------|------------------||
-----6--0-3-5-|-0-0-0-0-0-0-0-0--||
  .     .       . . . . . . . .

Ending B)
|----------------------||
|----------------------||
|----------------------||
|----------------------||
|2"--1"--2"-4"---------||
|----------------------||