This is the song that plays in between levels from Doom. Enjoy!
( ) = palm mute
{intro, 'drum' part)
G|-----------------------|
D|-----------------------|
A|-----------------------|
E|----(0000000000000)----|
{Main riff} (x2)
|------------------------------------------------|
|------------------------------------------------|
|------------------------------------------------|
|-0--0--3-p0--0--0--2-p0--0--0--6-p0--5-p0--4-p0-|
|------------------------------------------------|
|------------------------------------------------|
|------------------------------------------------|
|-0--0--3-p0--0--0--2-p0--0--0--6-p0--5-p0--4----|
Then play the main riff twice more on the G string. Repeat.
Guitar with high distortion playing both E strings enters in at this time, as well.