DOOM 1 Threat music
Outskirts – At Doom’s Gate – E1M1
Industrial Complex – The Imp’s Song – E1M2
Shaded Citadel – Dark Halls – E1M3
Shoreline – Kitchen Ace (And Taking Names) – E1M4
Garbage Wastes – On The Hunt – E1M6; E3M6
Five Pebbles – Demons On The Prey – E1M7; E2M5; E3M5
The Exterior – Sign Of Evil – E1M8; E3M4
Farm Arrays – Hiding The Secrets – E1M9; E3M9
Sky Islands – I Sawed The Demons – E2M1
Drainage System – The Demons Of Adrian’s Pen – E2M2
Chimney Canopy – Intermission From Doom – E2M3
Subterranean – Deep Into The Code – E3M3
Will conflict with any mod that messes with the threat music of regions listed above.
Original DOOM midi files were used with gzdoom soundfont[github.com]
DOOM made by id Software
Composed by Bobby Prince
yes, it has layers