intro riff 
----------------X
----------------X----
----------------X---------
------2---4-----X-----------
--/4------------X------------
 
there's a lot of pick scraping in the song so add it into the riffs to create the best sound

main riff
--------X----X--------------------------------------
--------X----X---------------------------------------
--------X----X-----5///----5///----4///------
--------X----X-----5///----4///----3///-------
--------X----X------------------------------------------
----5---X----X-------------------------------------------

repeat this for the verses until you can hear the change in the music-
for that it goes like this:

--------------------------------------
------------------2---------------------
------5---(4)-----2----------------------
------5---(4)-----2-----------------------
------------------4------------------------
--------------------------------------------