Michael Jackson's real life self is definitely a multiclass Expert/Aristocrat, but d20 modern classes might be more appropriate.
Now, if you're creating a caricature of him using D&D PC classes, he'd be a bard, but bardic magic doesn't exist in real life, and he can't cast Gaseous Form by singing Thriller. But yes, if you’re just basing a D&D NPC around him, make it a bard. And I think that would be a relatively interesting concept.
Also, as for him being a pedophile or not, I seriously doubt he is. I just think he’s an eccentric who suffers from serious psychological maladies due to his lack of emotional support growing up.