Listed from early years till now!
There could be some rare ones




Ease On Down The Road [1975]
A Brand New Day - The Wiz (Diana Ross & MJ) [1978]
You Can't Win [1978]

Who's Right, Who's Wrong - Kenny Loggins [1979]

When We Grow Up - Michael Jackson ft. Roberta Flack
Surprise song (The Jacksons) [not real song, but no fake]

1980's

All I Do (Duet with Stevie Wonder) [1980]
I'm in love again (feature MJ & Minnie Ripperton) [1980]
This Had To Be - The Brothers Johnson feat. MJ [1980]
Night Time Lover ! Fire is the feeling - Michael & La Toya Jackson [1980] short album version
Save Me (M.Jackson & Dave Mason) [1980]

Goin' Back To Alabama - MJ & Kenny Rogers [1981]
Just Friends - Carol Bayer Sager [1981]
The man (MJ & Paul Mccartney) [1981]

Muscles - Michael Jackson & Diana Ross [1982]
Can't Get Outta The Rain [1982]
Don't Let A Woman Make A Fool -  Joe King Carrasco [1982]
Papa Was A Rolling Stone - Bill Wolfer [1982]
So Shy - Bill Wolfer [1982]
State Of Independence - Donna Summer feat. MJ [1982]

Say, Say, Say (M. Jackson & Paul McCartney) [1983]
State Of Shock (ft. Freddie Mercury) Demo [1983]

Centipede - Michael & Rebbie Jackson [1984]
Don't Stan Anoder Chance - Janet Jackson [1984]
Somebody's Watching Me (With Rockwell) (Extended) [1984]
Tell Me I'm Not Dreamin (feature Jermaine Jackson & MJ) [1984]

We are the world (M.Jackson & Friends) [1985]
Eaten Alive (Diana Ross) [1985]

Get It (stevie wonder - Duet With MJ) [1987]
Get It (12'' Remix) (M.Jackson & S.Wonder) [1987]
Fly Away - Michael & Rebbie Jackson [1987]

2300 Jackson Street [1988]

Upside Down (Diana Ross & Michael Jackson) LIVE Performance

Doobie Brothers - Here To Love You

1990's

Do The Bartman - Simpsons [1990]
To Satisfy You - Michael Jackson & Bryan Loren [1990]

I Never Heard - Safire [1991] -

Whatzupwitu (feat Eddy Murphy) [1992]
Yeah - Michael Jackson & Eddie Murphy [1992]

Why (ft. 3T) [1994]

I Need You - 3T [1995]
On The Line - Ft Babyface (Edited) [1995]

2000's

It's Not Worth It - MJ & Brandy [2001]
Crush (Feat. Lenny Kravitz) Instruments [2002] fake?!
Hold my Hand [2008] ft. akon