G|----------------------------|-----------------------------------
D|----------------------------|-----------------------------------
A|-----------4-4-4-4-4-4-4-4--|-------4-2-------------------------
E|-0-0-0-0-0------------------|--2--2------4-5-------------------- 
play several times.... then right before lyrics start.. 
[ Tab from: https://www.guitartabs.cc/tabs/f/foo_fighters/my_hero_btab.html ]
-=chorus=-
G|----------------------------------------------------------------
D|----------------------------------------------------------------
A|-------------------------------4-4-4-4--------------------------
E|5-5-5-5-5-5-5-5-5-5-5-5-5-5-5----------0-0-0-0-0-0-0-0--7-7-7-7- 

-=quiet bridge part=-
G|----------------------------------------------------------------
D|----------------------------------------------------------------
A|----------4-----------4-----------------------------------------
E|-0----0-------0----0--------0-0-0-0-0-0-0-0-0-0-0-0-0-0-0-0-0--- 
gradually louder.....