Elvis was discovered, and ruined, by an (alleged) illegal immigrant from Lithuania, which was one of the reasons why Elvis never performed outside the USA, Parker realising that if he accompanied Elvis abroad, he’d never be allowed back in.
As he matured, so did his voice, and it was felt that there wasn’t a song he couldn’t sing … “If I can Dream” from his comeback special, after discharge from his military service, is just one example:
What could Elvis have achieved under proper management?
Ernest Evans is said to have used the stage name of Chubby Checker as a play on words of Fats Domino. Sadly, his career seemed to revolve around that atrocious activity called The Twist, and it didn’t last, as did not those who failed to adapt to music tastes (I’m afraid I include Ricky Nelson in this).
Many British pop stars seemed to try to be clones of the early Elvis, and few survived very long, though Harry Webb seems to have done quite well.
I could go on, but would note everybody. Music tastes, like humour, is subjective after all.
……
JH: I’d just add:
https://en.m.wikipedia.org/wiki/Elvis_Presley
https://en.m.wikipedia.org/wiki/Colonel_Tom_Parker