Riff 1:

C |--------------5p3--------|
G |---------3h5------3-3h5^-|
Eb|----0h2------------------|   x8
Bb|-2-----------------------|
F |-------------------------|
C |-------------------------|

Riff 2:

C |---------------------|
G |---------------------|
Eb|---------------------|   x4
Bb|-7--6--5--4----------|
F |-7--6--5--4-/8---7---|
C |-5--4--3--2----8---7-|

Riff 1 x8

Riff 2 x4

Riff 3:

C |-----------------------|
G |-----------------------|
Eb|-----------------------|   x10
Bb|-7--6--5--4-/10----9---|
F |----------------10---9-|
C |-----------------------|

At the last 2 times the song fades to silence.