wednesday
Jesus
I think Nightwish's Tarja has a very powerful voice.
But I prefer Robert Plant for vocal flexibility and ability, which is powerful in itself, but in a different way.
Nightwish died when tarja left, she has a fantastic voice regardless of what microphone delay she uses.
I chose simen Hestens simply because of his role in Dimmu Borgir, his voice sounds fantastic when belnded with the heavy operatic feel of their music.