I lied
I had a ton of downtime and pounded this out rather quickly. This isn't NEARLY everything, but is just what I can name off the top of my head (which is sad). There's a ton more in-depth discussion to go along with it, which I hope to be able to provide soon-ish!
? "Iowa" (c. April 1977). Classical piece/no vocals. Believed to be the first classical track Michael wrote, and was apparently one of two songs presented to award-winning conductor David Michael Frank during an April 2009 meeting for a planned instrumental album (unconfirmed).
? "Susie" (c. September 1977). Early demo tracking for "Little Susie". Lyrics are mostly, if not entirely, parallel to the final recording. Takes place during the Holocaust (so says Brad Buxer).
? "Behind the Mask" (c. October 1981). Lyrics based on a W.B. Yeats poem, "The Mask". Originated as a backing piece for a Japanese wristwatch commercial before being adapted by the Yellow Magic Orchestra, whose proper version eventually made it to Michael. Co-writer Chris Mosdell wrote an entirely new lyric with Michael in mind, though this version was largely discarded. Kept off of Thriller due to a crediting dispute (Michael wanted full royalties), which was resolved in 1985.
? "Make a Wish" (c. April 1983). Written by Michael and Buz Kohan for an unrealized Peter Pan feature film. Director Stephen Spielberg would purportedly play Michael's demo for his young son to help him fall asleep at night.
? "Neverland Landing" (c. April 1983). Written by Michael and Buz Kohan for an unrealized Peter Pan feature film. Resembles "Seeing Voices" tonally/musically.
? "What's Your Life" (c. 1983). Duet between Michael and Jermaine; features Tito on acoustic guitar. Written after an incident involving Michael attempting to purchase a llama.
? "Scared of the Moon" (c. March 1984). Conceived from a story Brooke ******* told Michael of her younger sister. Multitrack believed to have been lost by Michael shortly after its recording; the strings were recorded over a single piano/vocal track (similar to what would ultimately occur with "Love Never Felt So Good" in 2014).
? "Chicago 1945" (c. May 1984). Written over a groove submitted by Steve Porcaro. References various Chicago landmarks and locations. Concerns three girls who went missing and were never seen again. Vocally/musically complete. Was considered for Xscape, but was withheld by Steve Porcaro because he was against it being remixed.
? "Tomboy" (c. March 1985). Features Roger Troutman of Zapp on rhythm guitar. Melodically resembles "Remember the Time".
? "You Were There" (12 November 1989). Written around an instrumental piano accompaniment written by Kohan; lyrics were a collaboration between the two. Written the night before the Sammy Davis, Jr. tribute show, and performed once. Never recorded.
? "For All Time" (May 1990). Chord arrangement inspired by "Daydream Believer" by The Monkees. Title inspired by "Wichita Lineman" by Jimmy Webb. No known explanation as to why it was included on Thriller 25.
? "Someone Put Your Hand Out" (c. May 1991). Originally titled "Someone Put Your Hand Down". First recorded during the Bad sessions and rewritten with Teddy Riley during the Dangerous sessions. FInished in April 1992 and released as a Pepsi exclusive to coincide with the Dangerous World Tour.
? "Joy" (c. July 1991). Given to Teddy Riley's vocal group Blackstreet. Michael's recording is said to feature breathtaking vocals (so says engineer Jean-Marie Horvat). Teddy Riley has expressed interest in handing over his cassette copy of Michael's version to the estate.
? "Is It Scary" (c. June/July 1993). Originally titled "Is This Scary". Intended for the soundtrack of Addams Family Values.
? "Much Too Soon" (c. April 1994). Recorded over 5-6 takes and immediately shelved and never mentioned again. The 2010 album version does not credit guitarist Jeff Mironov, who plays well over 95% of the final guitar layer.
? "Willing and Waiting" (c. May 1994). Collaborative effort with Babyface. Ranks among Brad Sundberg's favorite Michael Jackson songs.
? "Angel" (c. October 1997). Collaborative effort with Babyface. Michael apparently called the song one of the best he had ever recorded, and had initial desires for it to be the lead single from the album.
? "Seeing Voices" (c. November 1997). Written by Sidney Fine. Submitted to Michael through Matt Forger. String addition suggested to Fine by Michael.
? "The Way You Love Me" (c. July 1998). Originally titled "Hanson" and intended for the preteen boy band of the same name.
? "Escape" (c. June 1999). One of Michael's personal CD copies was titled "Xscape".
? "Fall Again" (c. October 1999). Prince Jackson's illness is often given as the reason why it was never finished, though (as claimed by D. S.H.I.E.L.D.S.) there was a secondary fault on Michael's part that caused him to lose interest.
? "Shout" (April 2001). Almost never recorded, as Michael expressed concern about performing such a fast-paced rap live. Left off of Invincible in favor of "You Are My Life" and included on the CD single of "Cry" without notifying the cowriters.
? "I Am a Loser" (January 2003). Written by Michael and Brad Buxer after the latter experienced a devastating breakup.
? "Wonderful World of Candy" (c. July 2003). Described by Joe Jackson as "beautiful".
? "Gloucestershire" (c. January 2004). Written by Michael and Brad Buxer. Recalls one of Michael's fondest memories from the Jackson 5's touring days in Gloucestershire, a county in Southwest England. Vocally fragmentary; very incomplete.
? "I Have This Dream" (October/November 2005). Vocals by the O'Jays, James Ingram and others recorded on 1 November in Los Angeles, with Michael producing over the phone. Track exists in a complete state, but was never issued.
? "He Who Makes the Sky Gray" (c. March 2006). Written by Abdullah bin Hamad bin Isa Al Khalifa (and purportedly Jermaine Jackson). Features a gospel choir. Vocals were recorded and are apparently complete.
? "I'm Dreamin'" (September 2006). Collaboration between Michael and will.i.am. Proposed for will.i.am's 2014 album, #willpower, which was blocked by the estate.
? "Best of Joy" (October 2008). Originally written in 1982 as "The Toy". Re-recorded at least twice between then and 2008.
? "I Was the Loser" (October 2008). A recreation of "I Am a Loser". Chorus lines re-recorded to reflect the new title; all other vocals and music remained the same. Originally planned to be on Xscape.
? "H2O" (c. October 2008). Alternatively titled "Dark Lady". Vocally incomplete - the same lines are sung almost on loop.
? "Breathe" (c. May/June 2009). Instrumental piece exists, but vocals were never recorded. Lyrics regarding global welfare were intended to be cowritten with Deepak Chopra.