Michael has the most beautiful voice I've ever heard, period. When he sings, forget it. Nobody's voice is that good. "Someone In The Dark", "Lady In My Life", "She's Out Of My Life", "Fly Away", "For All Time", "Man In The Mirror", "Gone Too Soon", "Heal The World", "Lisa It's Your Birthday", "Childhood", "Smile", on and on, just unmatched.
His speaking voice is fantastic too. Just in general, his voice is very clear, clear as a bell, as was said, pure in tone, and youthful. And on top of that, very, very multi-dimensional. He has so many fascets to his voice, there is nothing 2-D about it, it's just very rich and full of depth. Sometimes when he talks, he's almost got a cartoonish-quality, like something you would expect a cartoon character to sound like, other times he's just very soft-spoken and calming. Probably one of the best examples of that is an interview he gave in 1987 to Molly Meldrum. One line he said almost put me to sleep, lol. He was talking about how he writes music and I can't remember specifically what he said, but it was said softly, lol. The whole interview is that way.