Song: Metro
Band: System Of A Down
Bassist: Shavo

I play on a 5-String, but if you only have a 4 then you can just tune your E string to C and you'll be able to play it.

Wait for Guitar and Drum intro, listen to song for timing
Verse:
G---------------
D---------------
A---------------
E---------------
C0-76-0-8-55-87-

Chours: 
G-------------------------------------------------------------------------
D-------------------------------------------------------------------------
A-------------------------------------------------------------------------
E-------------------------------------------------------------------------
C55555555-77777777-33333333-1010101010101010-55555555-77777777-3-3-3-3-3-3
                            (these are 10's)

Verse:
G---------------
D---------------
A---------------
E---------------
C0-76-0-8-55-87-

Chours:
G-------------------------------------------------------------------------
D-------------------------------------------------------------------------
A-------------------------------------------------------------------------
E-------------------------------------------------------------------------
C55555555-77777777-33333333-1010101010101010-55555555-77777777-3-3-3-3-3-3
                            (these are 10's)

After Chours
G---------------------------------------------------
D---------------------------------------------------
A---------------------------------------------------
E---------------------------------------------------
C3-3-3-3-3-33-3-3-3-3-3-33-3-3-3-3-3-33-3-3-3-3-3-33

Verse Variation: 
G---------------
D---------------
A---------------
E---------------
C0-7-0-6-8-5-87-

Chours: 
G-------------------------------------------------------------------------
D-------------------------------------------------------------------------
A-------------------------------------------------------------------------
E-------------------------------------------------------------------------
C55555555-77777777-33333333-1010101010101010-55555555-77777777-3-3-3-3-3-3
                            (these are 10's)

Outro: played very fast
G--------------------
D--------------------
A--------------------
E--------------------
C00-77-66-88-55-88-77

Thats all, just listen to the song for timing