One thing about Michael Jackson:
You can not judge his voice because it is simply flawless.
Not many people can actually have a great voice and pull it off in any type of song or live. His tone is astonishing and suits every style of song no matter the genre, speed, tone, depth, etc.
And in antithesis to most artists, Michael can sing anything live without fault. His voice is amazing live unlike others and has no intention to mime. With a voice like that, it is purely from God. Like an angel from the skies above - he is exquisite in many remarkable ways.