Standard tuning, no capo

/ = slide down
 = natural harmonic

Into/Riff
----0----0-----0-----------------------------------------------------|
--------------------3-----3-----3------------------------------------|
------0-----0----0-----0-----0----0--5----5----5----4----4----4------|
---------------------------------------5----5----5----5----5---------|
---------------------------------------------------------------------|
12/0-----------------------------------------------------------0-----| x 2

Part II (directly after Intro leading into verses)
------0-----0-----------0----------------------------|
-0-------3-----3--0----------------------------------|
----1----------------1-----------------------------------|
---------------------------------------------------------|
---------------------------------------------------------|
---------------------------------------------------------|
(Part II is played after every chorus)

There's also a consistent 4/4 strumming of the open low E string during the
Intro/Riff but this is might be executed by the bass in the song so I chose
not to incorporate it in the tab.