The game's composer, Mike Gordon, has gone to great lengths to pay homage to the original game's metal soundtrack from back in the day, but updated it for a 2016 audience.
"Hell in Doom is just horrifying. It's ancient and threatening and violent. It's a nightmare," says Gordon in a recently released behind-the-scenes look at the creation of the game's brutal score. 

The composer used 'vast arrays' of analogue equipment from vintage Soviet-era synths, to 'bizarre and obscure' guitar effect pedals to recreate hell in audio form.
The composer has however, gone even further down the road to hell by hiding imagery within the soundtrack.
When passed through a spectrogram, the track called Cyberdemon throws up images of “666” and a pentagram. Gordon hinted at the hidden imagery in the second part of his Youtube documentary about the Doom soundtrack.
One curious fan tested the hint and found the images hidden in the Cyberdemon spectrogram. Doom is out now on PC,PS4 and Xbox One.