How many octaves could Michael Jacksons sing?

Vocal Timbre: Spinto, Countertenor, Baritone (in the song 2000 Watts of Invincible album, for example)

Highest note: B5

Lowest note : E2

Vocal range: 3.6+ octaves (E2-B5; 44 notes by the middle of 1980s according to Seth Riggs, Jackson's vocal consultant (Quote from Seth Riggs); in the 1990s, Riggs said the range expanded to 4 octaves. Apparently, due to aging, Jackson got few additional lower notes, while not losing the highest ones.)