um, i got the doom game and heard the main song. right there i new i had to play it,
so... i made a tab. its not all corect, but better than some that i have seen. enjoy.

 Bass comes in at 0:07

Tuning: Drop D (D A D G)
G|-----------------------------|-----------------------------|-----------------------------|
D|-----------------------------|-----------------------------|-----------------------------|
A|-----------------------------|-----------------------------|-----------------------------|
D|----0-0-0-0-0--0-0-0-0-0-----|-----0-0-0-0-0--0-0-0-0-0----|-----0-0-0-0-0--0-0-0-0-0----|

Riff A
G|-----------------------------|-----------------------------|-----------------------------|
D|-----------------------------|-----------------------------|-----------------------------|
A|---3-5---5/6---5-8--3-5---0-1|0--3-5----5/6---5-8--3-5--0-1|0---3-5---5/6---5-8--3-5--0-1|
D|-0-----0------0---0-----0----|--0-----0------0---0-----0---|--0-----0------0---0-----0---|

G|-----------------------------|-----------------------------|-----------------------------|
D|-----------------------------|-----------------------------|-----------------------------|
A|---3-5---5/6---5-8--3-5---0-1|0--3-5----5/6---5-8--3-5--0-1|0---3-5---5/6---5-8--3-5--0-1|
D|-0-----0------0---0-----0----|--0-----0------0---0-----0---|--0-----0------0---0-----0---|

G|-------------------------------|
D|-------------------------------|
A|---3-5---5/6---5-8--3-5---0-1-0|
D|-0-----0------0---0-----0------|


                              
                                [Break]
Riff B

G|-------------------------------|-------------------------------|-------------------------------|
D|-------------------------------|-------------------------------|-------------------------------|
A|-------------------------------|-------------------------------|-------------------------------|
D|-0000/3\000088555555/6\5555553-|-0000/3\000088555555/6\5555553-|-0000/3\000088555555/6\5555553-|

Bridge
G|--------------------------------|-------------------------------|------------------------------|
D|--------------------------------|-------------------------------|------------------------------|
A|--------------------------------|-------------------------------|------------------------------|
D|-0----------0----------0--------|-0----------0----------0-------|-0----------0----------0------|

G|--------------------------------|-------------------------------|
D|--------------------------------|-------------------------------|
A|--------------------------------|-------------------------------|
D|-0----------0----------0--------|-0~~---------------------------|


You can either play Riff D instead of C here, or chug along with the guitar:

Riff C
G|-------------------------|-------------------------|
D|-------------------------|-------------------------|
A|-------------------------|-------------------------|
D|-000333777333555333222333|-000333777333555333222333|

G|-------------------------|-------------------------|
D|-------------------------|-------------------------|
A|-------------------------|-------------------------|
D|-000333777333555333222333|-000333777333555333222333|

Riff D
G|------------------------|------------------------|
D|------------------------|------------------------|
A|------------------------|------------------------|
D|-0--3--7--3--5--3--2--3-|-0--3--7--3--5--3--2--3-|

G|------------------------|------------------------|
D|------------------------|------------------------|
A|------------------------|------------------------|
D|-0--3--7--3--5--3--2--3-|-0--3--7--3--5--3--2--3-|






Riff B
G|-------------------------------|-------------------------------|-------------------------------|
D|-------------------------------|-------------------------------|-------------------------------|
A|-------------------------------|-------------------------------|-------------------------------|
D|-0000/3\000088555555/6\5555553-|-0000/3\000088555555/6\5555553-|-0000/3\000088555555/6\5555553-|

Riff E
G|------------------|------------------|------------------|
D|------------------|------------------|------------------|
A|------------------|------------------|------------------|
D|-0-0-0-0--0-0-0-0-|-0-0-0-0--0-0-0-0-|-0-0-0-0-0~~------|