I really doubt all of the tracks that were made for Sonic 3 came from Jackson's beatboxing. Most, if not all of the folks involved with the Sonic 3 soundtrack from the MJ/Buxer team were already talented songwriters. Yes, he did make a demo tape & he did give ideas during the entire process, but his contributions are unclear except for the general number of "1-3 cues" that Brad has said before. Another point would be his hectic schedule from 1993, where he was working on short films & attending events a lot (prime example would be his cut promotion for the film "Addam's Family Values" & work was beginning on the short film for "Dangerous" iirc, at least storyboarding/choreography). Brad Buxer's definitely the one who came up with the original demo of "Stranger In Moscow" / the Sonic 3 credits theme. It doesn't even seem like Michael knew that "Stranger in Moscow" was taken from the credits theme, as even as early as November 1993, Michael's story is "Brad played some chords on the keyboard & I started writing a song from there." Also with Brad not taking credit, he just kinda does that.