System of a Down song is CUBErt

Intro is a guitar thing
Then it goes into this
Tunning: drop D then one whole step down (C.G,C,F)


C|-333333333333-|
That is about how many times you hit it

Pre chorus or whatever you want to call it

C|----8-----6--
G|------9-----7
C|--------------


Chorus:

G|--------------6666-3333--
C|3333-6666----------------


He also uses a variation for the Chorus about 6 times which is 

C|----8-----6-----4
G|------9-----7------5
C|---------------------

Email me with corrections Alien334@prodigy.net.