Of course the answer just made the question all the bigger. He's a hillbilly singer from Memphis. He sorta' sings the blues. He has sideburns and walks down the street wearing black lace shirts and pink pants.
When you combine high levels of talent with charisma and mystique, you change the world.
Clive Davis and Rick Rubin and the folks who eventually brought down the music business thought that they could manufacture that stuff. Those boys were trying to bottle lightning.