Some totally fucked up suggestions, most of them are probably useless:
* King Crimson - 21st Century Schizoid Man (with fucked up guitar solo)
* Electric Sun - Earthquake (I DARE YOU!)
* Laibach - God is God
* Living Colour - Cult of Personality
* Some old Uriah Heap tune from Demons and Wizards
* Queen - The Prophets Song (in a very dark and gloomy version with loads of contrast between aggressive and moody throughout the song).
*
Apache. There used to be a billion covers of this 40 years ago, but it has loads of arpeggios, good melody, and some parts that I think translate pretty well to death
Can Caligula sing clean?
While hearing your rendition of Sails of Charon would be fun (and a challenge), it has been done a million times. Some pop (Madonna, etc) would be cool, but only if it is as well translated as that old obscure band did Summernight City.
By the way, could you please be my hero and tell me the chord progression for the clean solo in Hunger? It's the only demonoid solo that I can vaguely transcribe since I noticed that the harmony was split in stereo
Cheers,
Jacob.