Also to the guy who posed the question, their are a few tricks to protect your voice, but much like certain facets of weight lifting you have to find your own ways unique to you. One of the best ways is use YOUR voice and don’t try to sound like another vocalist. It’s not your voice so don’t stress your chords trying to make them sound like Sylvain Houde (find live footage of this lunatic) because you won’t. Back in the hey day you could instantly tell which vocalist was who on a mix tape as soon as you heard them. There wasn’t much copying each, just harsh, unforgiving voices. Some belched, some yelled, some growled, some shrieked. But these vocalists also realize that, again, much like weight lifting if you spend all your time trying to baby your vocal chords you will sound like an un-emotive phony. Extreme metal hurts and singing like this will hurt. And there’s no feeling as good as doing it well.