Not Singers, But Actors
A few of my favorite voices (among actors):
James Earl Jones - He has the ultimate voice. There is no contest, he's already won.
Jeremy Irons - I am 100% heterosexual, but his voice makes him one sexy beast
Morgan Freeman - He not only acts in Shawshank, but he narrates it. Not everyone would have been able to pull off this narration and make it so captivating and moving. It's an absolute sin that this movie did not win any Oscars.