Peabo Bryson is a monster vocalist who I believe still performs regularly out in Vegas.
He studied/studies with Seth Riggs and has an incredible instrument. Very full and very intense, and even when he bends the rules he’s not bending them that much – he tends to sing fairly emotive ballads and the like, but even if you’re not into that kind of music, it’s well worth checking out to hear what this guy can turn out. It’s awesome.