artifacts of the black rain 

sounds close, i probably missed a bit tho
standard tuning

riff 1
g----------------------------------------------
d----------------------------------------------
a--------------------------4-3-2---------------
e--1--1--3/4----1--1--3/4--------44-33-11-33---
it sounds like ait needs a bit extra at the end bit i cant quite 
make it out

riff 2
g----------------------------------------------
d----------------------------------------------
a-------------1-11-----------------------------
e-1-11--4-44-------2-22------------------------
same thing.. something i cant hear right at the end , 
might just be low guitar

riff 3
g----------------------------------------------
d--3-1---------3-------1-----------------------
a-------4---------1--4-------------------------
e----------1-----------------------------------
riff 4 [right after nasty guitar]
g----------------------------------------------
d----------------------------------------------
a--------------------3---3---3---3---3---------
e---3-3-3-3-3-3-3-3----------------------------
.. or some other such nonsence on open e+a +3rd fret e+a strings
tabed by stark[chris guite]