This midi first appeared in DOOM, but its also DOOM II level 10, and some other levels.  
song in the game.  Sounds dark too!! :)

e|----------------------------------|
B|----------------------------------|
G|----------------------------------|
D|----4-3---5-4------4-3---2-0------|
A|--2-----2--------2-----2-----4-0--|
E|----------------------------------| 4x

e|----------------------------------|
B|----------------------------------|
G|----------------------------------|
D|----0-----1-0------0--------------|
A|------4--------------4---3-1-0----|
E|--3-----3--------3-----3-------1--| 2x

Repeat everything again (1st part 4x, 2nd 2x)
Then first part twice followed by this:

e|------------------------------|
B|------------------------------|
G|------------------------------|
D|----0-----1-0-----------------|
A|------4------------2-1---3-2--|
E|--3-----3--------0-----0------|

Then everything repeats, only thing that changes is the octaves.