I happened onto late older artists the other night and was astounded how 'utterly smooth' Nat King Coles voice was....and how well written his songs.... Too bad there's no artists I know of today with such a smooth voice and clearly a man of his art.
However..this was fun to hear and watch....
...."Let's Get It On"..... https://www.youtube.com/watch?v=XFIND_mVOL0