My favorite singer Enrique Iglesias But it changes every day.Have you ever heard the worst songs? And a singer you want to torture?(Justin Bieber)
He's perfection
Disturbed vocalist. I don't know his name but his voice .. ohh amazing :D
Hmmm... Male or female? Does it matter?
I always loved Usher's voice. Justin Timberlake as well. Can't leave out John Legend either.
As for females, I think one of the best voices I had ever heard was the singer from Florence and the Machine.