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.