Black and death metal bands can be compassed along the following axes:
Materialist
^
|
Horny < - . - > Bloodstained
|
v
Occult
So Lamp of Murmuur are somewhere towards bottom left.
Rotting Christ are bottom, slightly right of centre.
Carcass can be found at top right.
And there probably needs to be a secret, third axis for "Tolkien", where Summoning live.