His vocal versatility allowed him to transitions through different genres and different vocal technique, from edgy rock, to soft & light. His full voice as well as his falsetto were stronger than the that of a typical male and allowed him to hit higher notes. https://twitter.com/iwantdestinyy/status/1348766528791998464
His ability to mix his head and chest voices to hit raspy full high notes in songs like Earth Song and Dirty Diana is till this day unmatched and I've never see anyone who can pull off those vocals with the strength and intensity. A one of a kind vocalist.
He was also able to create distinct sounds and vocal hiccups (Hee Hee's) as well as beatboxing to add and control the emotion in his vocal delivery.
Sorry for the typos, rushed and I'm not doing it again