I have recently been listening to more brutal death metal and black metal and I have heard some fairly brutal vocals from both styles, but I am currently trying to hear something more on the extreme side, with frightening vocals of the demonic variety. This may sound like a stupid question but what would be the best bands that have the most exteme screeching vocals or low growls in the black or death metal realm or even grindcore, sorry no drone or doom, kthnx