In reply to The Lemming:
Elvis had the incomparably better voice. It was more or less the whole secret, the magic ingredient of his success (since he was not a musician/song writer), and of course his performance. 80 per cent voice; 20 per cent performance.
I remember seeing a documentary once about Bryn Terfel, the Welsh bass-baritone, and he said he often listens to Elvis in his car because he wishes he could sing as well.
But even Elvis said that no one could sing as well as Roy Orbison, and I think I agree.
Post edited at 15:44