Intro (starts with only bass)
G--------------------------------------------
D--------------------------------------------
A---15/14-14/12---12-13-12-10---10---12-13-12
E-0-------------0-------------0----0---------
Second Part (heavy distortion on the guitar)
[ Tab from: https://www.guitartabs.cc/tabs/s/system_of_a_down/mr_jack_btab_ver_5.html ]
G------------------------------
D------------------------------
A------------------------------
E-0-7-3-7h8p7h8p7-0-7-3-7h8p7h8
Verse
G---------------
D---------------
A---------------
E-0-7-3-77-88-77
Chorus play second part again
the end is basically just 8th and 16th note runs on the same frets
