In terms of vocal talent, Jason Mraz has a beautiful voice in my opinion. It's so light and peaceful. Check out his live album Live at Java Joe's, especially the songs "Hey Love", "Unfold", and "Bright Eyes". But if we are talking raw soul, check out some of George Harrison's solo work. He may not have a beautiful voice, but the feeling is definitely there. Check out the acoustic version of "Beware of Darkness".