Oh I have lots of opinions too. Its just that mine are right (joke, joke). It seems to me sometimes that singing gets put into a strange category in that it is subject to the question "Is it natural or not?" in a way that playing other instruments isn't. As another thread shows there are an awful lot of sounds that can come from a guitar in the hands of an experienced and practiced player, but rarely do people ask "Is that natural?" I would agree that using your voice in a way that hurts you over and over again is not sensible but I wouldnt suggest that it was un-natural. A lot of people don't make use of their possible full range because it felt too strange and difficult the first time they tried and so they decided it was un-natural and didn't work to make it comfortable. When I was singing in a choir my voice was fit and I had no trouble hitting high notes or singing for a while on the high notes. Now that I'm not singing in the choir I know that my higher notes are out of practice and I couldn't do what I did two years ago, but I don't doubt that if I practiced again and got my voice back in shape I could reach and sustain music in the higher range. Just as I don't doubt that if I practice for thirty years I will finally be able to play an F chord on the guitar.