Song : Science
Band : System Of A Down

 r = ring
 ^ = accent

Riff 1
F---------------------------------------
C---------------------------------------
G-5----------5---------5--------------
C---000000---00000---00000------

Riff 2
F---------------------------------------
C---------------------------------------
G-7---7-7-8-10-8-7-5---------------
C---------------------------------------

Riff 3
F----------------------------------------
C----------------------------------------
G----------------------------------------
C-6-5555555555-6-5555555555---

F--------------------------------------------------
C--------------------------------------------------
G--------------------------------------------------
C-6-555555-6-555555-6-55-6-55-6-55-6-5-

Riff 4
F----------------
C----------------
G--5?6?7---
C----------------

Riff 5
F--------------------------------------------
C--------------------------------------------
G-5^--5^--5^--5^--5^--5^--5^--5^--5^-
C---------------------------------------5r?

Riff 6
F------------------------------------
C-----------------------------------
G-5r------5r------5r---------------
C--------------------------5r-------

Riff 7
F-----------------------------------------
C-----------------------------------------
G-5r-----5r----6-55-6-55-6-55-6-55?
C-------------------------------------------

And the order is : 
Riff 1x1
Riff 2x1
Riff 1x1
Riff 2x1
Riff 3x2
Riff 1x1
Riff 2x1
Riff 1x1
Riff 2x1
Riff 3x1
Riff 1x1
Riff 2x1
Riff 1x1
Riff 2x1
Riff 4x1
Riff 2x1
Riff 4x1
Riff 2x1
Riff 5x1
Riff 6x2
Riff 7x1
Riff 1x1
Riff 2x1
Riff 1x1
Riff 2x1
Riff 4x1
Riff 2x1
Riff 4x1
Riff 2x1
Riff 4x1
Riff 2x1
Riff 4x1
Riff 2x1

Enjoy it!!