NIGHTWISH singer Anette Olzon recently wrote a blog entry on her official web site where whe talked about singing technique. She said, "It's hard to go in to exactly what I do when I sing since some things are 'by nature' and just come naturally but, of course, a lot of things are what I have learned earlier in vocal lessons and also during my career as the singer in NIGHTWISH where my voice is needed to be able to sing many high-pitched songs for 1.5 hours many nights a week.
"First of all, what I use most when I sing is a technique called 'belting.' For you who don't know what kinda vocal sound types normally are talked about, there are different sounds and techniques to use when singing. This technique is a way to come very high up by pushing the vocal cords together, slamming them against each other, so that no air at all can leak through. If any air leaks through, it can make the voice soar and aching. I do this technique also by thinking that I lift my upper lift upwards, kinda showing my teeth and a good sound to practise for it is to imitate an evil witch. You know the evil laughter. Also imitating a car like: öhrn, öhrn, öhrn... as a car accelerating forward. These things make me lift the lip and close the cords. Of course there are so many more things to do to make this technique perfect but that's an easier way to explain what I do."
Source: Blabbermouth
