There is only one correct answer, Elvis. He will never be equalled as a vocalist and a performer. There’s a magic in his voice that is perfectly pleasing to the human ear, no matter if he’s singing rock, a ballad, blues, country r&b or gospel.
The Beatles all idolized him, Jimi Hendrix’ father took him to an Elvis concert and the next day got him his first guitar.
500 years from now people will still marvel at his voice, his charisma and incredible performances. He’s one in a trillion. Get the Elvis That’s The Way It Is blu-ray and Elvis 56 DVD and you’ll understand.