This is how the song is played live.  It is played in Drop C tuning (CGCFAD).


   Toxicity
System of a Down

Intro Riff

D|--------------------------------------------------------------
A|--------------------------------------------------------------
F|--------------------------------------------------------------
C|---7---7---7---7---7---7------10---10---10---10---10---10---10
G|-5---5---5---5---5---5------8----8----8----8----8----8----8---
C|--------------------------------------------------------------
  
D|--------------------------------------------------------------
A|--------------------------------------------------------------
F|--------------------------------------------------------------
C|---7---7---7-8---8-7---7----10---12---12-10---10-8--10-10-----
G|-5---5---5-----5-----5----8----8----8-------8-------8--8------
C|--------------------------------------------------------------

                                                                   ___
Chorus Riff 1 (2x)                                                   |
  D|--------------------------------------------------------------   |
  A|--------------------------------------------------------------   |
  F|--------------------------------------------------------------   |
  C|-0------------------------------------------------------------   |
  G|-0---32020----8-8888-7-7777-----------------------------------   |
  C|-0---32020----8-8888-7-7777-----------------------------------   |-----Full Chorus
P.M...   .....                                                       |
                                                                     |
Chorus Riff 2                                                        |
  D|--------------------------------------------------------------   |
  A|--------------------------------------------------------------   |
  F|--------------------------------------------------------------   |
  C|--------------------------------------------------------------   |
  G|-3200000-032000-0-3200000-0320000--8-8888-7-7777--------------   |
  C|-3200000-032000-0-3200000-0320000--8-8888-7-7777--------------   |
P.M. ....... ...... . ....... .......                                |
                                                                     |
After chorus riff 2 repeat chorus riff 1 once.                    ___|

Verse Riff (3x)
  D|----------------------------------------------------------------
  A|----------------------------------------------------------------
  F|-----------------------------------9----10----9-----------------
  C|----7---7---7---7---7---7-----10-----10----10---10--------------
  G|--5---5---5---5---5---5-----8----8-----8-----8----8-------------
  C|----------------------------------------------------------------
                     

  D|----------------------------------------------------------------
  A|----------------------------------------------------------------
  F|----------------------------------------------------------------
  C|----7---7---7-8---8-7---7----10--12--12-10--10-8---10-----------
  G|--5---5---5-----5-----5-----8---8---8------8------8-------------
  C|----------------------------------------------------------------

Now repeat the whole chorus again, then the verse 3 times again, then the chorus again, then this:

Interlude Riff 1 (4x) "Guitar Solo"
This part Daron plays with a water bottle, try it, it looks very cool.

  D|----------------------------------------------------------------
  A|----------------------------------------------------------------
  F|----------------------------------------------------------------
  C|----------------------------------------------------------------
  G|-12-121212-121215-1212-141212-----------------------------------
  C|-12-121212-121215-1212-141212-----------------------------------

Interlude riff 2 (2x)
  D|----------------------------------------------------------------
  A|----------------------------------------------------------------
  F|----------------------------------------------------------------
  C|----------------------------------------------------------------
  G|-0-0000-03-00200-0-0000-03-00200--------------------------------
  C|-0-0000-03-00200-0-0000-03-00200--------------------------------

Interlude riff 3 (2x)
  D|-------------------------------------------
  A|-------------------------------------------
  F|-------------------------------------------
  C|-------------------------------------------
  G|-0-0000-03-002^-0-0000-03-002^-------------
  C|-0-0000-03-002^-0-0000-03-002^-------------

Interlude riff 4 (4x)
  D|---------------------------
  A|---------------------------
  F|---------------------------
  C|---------------------------
  G|-3000020000----------------
  C|-3000020000----------------

Now repeat the whole chorus again, then interlude riff 2 twice then this:

Outro Riff (2x)
  D|----------------------------------------------------------------
  A|----------------------------------------------------------------
  F|----------------------------------------------------------------
  C|----------------------------------------------------------------
  G|-0003002--00030002----------------------------------------------
  C|-0003002--00030002----------------------------------------------


Goodbye Blue Sky Outro riff 1 (2x)
  D|----------------------------------------------------------------
  A|----------------------------------------------------------------
  F|-------0~-------------------------------------------------------
  C|---4--------4---4-----------------------------------------------
  G|-5---5--------5-------------------------------------------------
  C|----------------------------------------------------------------

Goodbye Blue Sky Outro riff 2 (1x)
  D|----------------------------------------------------------------
  A|----------------------------------------------------------------
  F|-----0---------0------------------------------------------------
  C|---4---4-----4---4---4------------------------------------------
  G|-2----------2-------2-------------------------------------------
  C|----------------------------------------------------------------

Repeat in that order once.

Well that's it.  Easy song, once you get used to the fast picking and fretting.  This is
my first tab, please rate it.