"he was the only singer I have ever known who could take a whole club evening on his own (with the possible exception of Peggy when she was on form)."

One I've heard do it is Adam MacNaughton. I didn't think to analyze what he was up to, but come to think of it he does use a fair variety of sound - it isn't just that he's a verbal magician. Comments from anybody out there who has observed what he does, technically?