If you asked me for proof that Michael ever worked on "Best of Joy" or "Much Too Soon," I could point you to studio session notes or lyric sheets in Michael's unmistakable and inimitable handwriting. If you asked the same for "Beautiful Girl," I could point you to footage of Michael listening to it with Brad Buxer, Geraldo Rivera, and Michael Prince in a Los Angeles recording studio. If you asked the same for "In the Back," I could acknowledge the simple fact that it was released during Michael's lifetime. Every song has some sort of link, whether its handwritten notes, video footage, audio of Michael in the studio discussing the song with someone, or a multitude of reliable witnesses who can attest to its legitimacy.
If you asked me that for "Breaking News," "Monster" or "Keep Your Head Up," I can give you absolutely nothing. That's where the confusion settles: they're the only songs in Michael's catalog that no one can prove are real.