This is interesting (taken from this article:
http://twitlonger.com/show/ji8v89)
UNKNOWN BRAD BUXER TRACK - I don't know the title of this song, but from what I've heard, I'm guessing that it is the long-time speculated Bottom of My Heart. I've only heard about 25-30 seconds of it, though. It is similar to Heal the World and Cry in terms of music; a smooth drum track that is slightly buried under the strings, pianos and guitars. Lyrically, it leans towards What More Can I Give and We Are the World. It's a down-tempo ballad about a tragedy. (If my memory serves me correctly, it was aimed towards a Hurricane Katrina disaster in 2006.) Michael even borrows a few ad-libs from What More Can I Give in the song ("Oh, my God! Oh, my God!" and "Teaching, I'm preaching my brother!"). The version I heard was taken from the ending of the song, where I assume a choir would have been inserted; however, since it's an unfinished song, it's just multi-layered vocals of Michael. "Sending love from the bottom of my heart."
UNKNOWN NEFF-U TRACK - "To have and to hold/ To love and to let go..." This is one of the more beautiful tracks Michael's made in his later years. Again, I've only heard about 25 seconds of this track, but it nearly brought a tear to my eye when I heard it. I don't know the title of this song, but according to my contact it was recorded in late 2008 with Neff-U. It's built on a piano and strings (similar to All I Need) with drums, bass and guitar coming in later. It sounds like an anti-war track, with Michael singing about parents having to let their children go off to war; I don't know if this is the base of the entire track though. It's mostly in falsetto.
UNKNOWN REDONE TRACK - This 30-second snippet of a RedOne song was played to me over a phone conversation, so I couldn't really make out everything that Michael was saying. Sounded something like, "...wasting your time with a man... let's get on the floor, babe!" He talks to RedOne, referring to him by his actual name (Nadir), saying "Nadir, turn this up a bit... little more... alright!" Michael even busts out a "hee! hee! hee!" which he hasn't done since Privacy back in 2001. I really missed hearing him do that. Musically sounds like a mix of Pokerface by Lady Gaga and the rhythm of Speed Demon.
UNKNOWN WILL.I.AM TRACK - This 20-second snippet was taken from one of the unfinished songs. (I believe it was Can You.) It's a mid-tempo track about falling in love with someone and wanting to live your life with them. He scats through part of it (pretty much the same type of scatting he does on In the Back), but the only true lyric I heard him sing was, "No matter how I try, with everything I find it's you, you on my mind all the time." Very catchy melody, soulful harmonies. Sounds like a mixture of Butterflies and a Stevie Wonder song. Built upon piano, synths and something that sounds like a synthesized flute -- interesting choice.