Artist - Burzum
Song - Det som engang var
Album - Hvis Lyset Tar Oss
All Instruments - Varg Vikernes

The Song starts with the keyboard, the guitar drops in at 2:48.

Main Riff
|----------------I I---------------I I---------------------|
|----------------I I---------------I I---------------------|
|----------------I I---------------I I---------------------|
|----------------I I---------------I I---------------------|
|-2--2--4--5--4--I I2--2--4--7--4--I I2--2--4--5--4--3--3--|
|-0--0--2--3--2--I I0--0--2--5--2--I I0--0--2--3--2--1--1--|

Repeat this Riffs over and over again after the last two chords.
        

There's some kind of solo which starts at about 7:56. 

Part 1                                                                Part 2 
|-------------------------------------------------------------------| |-------|
|-------------------------------------------------------------------| |-------|
|-10-10-10-10-10-10-10-10--12-12-12-12-12-12-12-12--6-6-6-6-6-6-6-6-| |--8-6--|
|-------------------------------------------------------------------| |-------|
|-------------------------------------------------------------------| |-------|
|-------------------------------------------------------------------| |-------|

Part 1: I guess that's how it's played, but I advise you to listen to the record.
Repeat Part 1 several times, Part 2 ends part 1 every second time (I guess).


End Riff
Play this one quite slow and let ring...you should listen to the song to get the timing and figure out how it has to be played.

|-------------|
|-------------|
|-------------|
|-------------|
|-2---2---3-0-|
|---0---0-----|