I don't know where to begin on this subject. Unreleased MJ music has always been intriguing to me, but the way the releases since MJ's passing went, the subject almost caues more stress than joy.
Here's a list I've compiled of songs, while at work, that are not released, and that we know for sure exist because we actually have heard them in either full) snippet) low quality).
Starlight
There Must Be More To Life Than This
State Of Shock (W Freddie)
Hotstreet/Slapstick
Nite Line
She's Trouble
Don't Matter To Me (not the butchered version we got)
The Girl Is Mine Demo
Deep in The Night
Groove Of Midnight
Throwin' Your Life Away
Speed Demon Demo
Earth Song Demo (80s demo)
Someone Put Your Hand Out Demo
Ghost of Another Lover
Jane Is A Groupie
7 Digits
Don't Believe It (Not 100% confirmed this is the song we've heard in the snippet from Shana)
Men In Black
Serious Effect
She Got It
If You Don't Love Me
Work That Body
Happy Birthday Lisa
Faces
We Be Ballin'
Family Thing
Elizabeth, I Love You
Seeing Voices
Days in Gloucestershire
People Of The World
Hollywood Tonight Demo
I Am (Was) A Loser
Can't Get Your Weigh Off Of Me
What More Can I Give (Solo)
I am sure I've missed some.
As far as I know, none of the above have been officially released. Now, these are all songs we know exist due to either having them in full or in snippets! I included demos of already released "final" songs that include different lyrics and different music. There are mixes/different cuts of many of the songs above which I have not included.
Now, there are tons of other songs that exist as well from each era, in which the general public (most of us) have not heard before as in:
fully unheard songs, demos, different versions/mixes, etc. Like SPYHA demo, Speed Demon demo, Starlight Demo - demos of already released songs, yet totally different to the released. And re-worked songs as well from an era to new.
We know those songs exist based upon confirmations from people who either worked on the songs, or from a few selected fans/people who have listened to them. And of course, from even Michael himself in various interviews/depositions/books, etc. Tons of titles and demos out there. Tons. Ready to release-tracks, just dug up this-tracks, never made it-tracks, incomplete-tracks, etc.
I cringe when I see people assuming there are little to no materal left for release in MJ's music world. It's simply not true. If you expect full recorded song with 2-3 verses and a chorus for every single next unreleased songs, then maybe you are right. But this is not a must in my opinion - at all.
My list of 34 tracks is only what has leaked that we know for sure exist. There were even more, but over the years, a lot of "leaked" music was released on The Ultimate Collection, re-issues, Michael album, Bad 25 and Xscape. Also songs like Mind Is The Magic and All In Your Name were released by the other involved artists. Probably forgot a few here as well.
We don't need a new album every year with 10 unheard songs before. An album with f. example 3 never before heard tracks, and the rest being either leaked before or alt. demos that sound different, would be interesting enough to me. There is no more the need to cave into the mainstream anymore. The releases should be treated and carved for the fans now. MJ has been gone since 2009 and I hate to remind myself of this. Show us the work in progress. Show us how this and that worked.
For example, one can argue that there is no point in releasing Faces which is basically a speech from MJ with a dope ass beat. But why not? It was his work and it is interesting. What's the matter with releasing a CD with the song included and the producers of the song talking about it, either in writing or in audio? This is just an example. Make something out of every thing.
There are endless of ideas and ways to how one can keep on releasing MJ music for years to come without putting it all out in one album.
Feel free to disagree, or help out with the list. In my opinion, there is MJ material enough for at least 100 more years of release if it's done right. Not only music, but footage as well. Only problem is that all people who worked with MJ in his life are getting older and older. 30-40 years from now, none of them will be around most likely. So certain projects should be done before others if you get my drift. Other problem is that the people responsible for the releases are complete and utter incompetent, undeserving and unfitting for the job.