I want to add Neil Diamond. I love his deep clear voice ("I Am I Said" is one of my favorites among others).
I had the privilege of seeing him in concert, in his prime in the late 60's, at a local college. It was one of my favorite concerts.
Oh, speaking of deep clear voices, this may sound strange coming from a non C&W fan, but I have always liked Johnny Cash's voice as well.
TIS
"Mankind must put an end to war before war puts an end to mankind. War will exist until that distant day when the conscientious objector enjoys the same reputation and prestige that the warrior does today." JFK