Marlon produced (except 1 song) Betty Wright's 1983 album Wright Back At You. Marlon did drum programming, percussion, synths, or background vocals on some songs.

Burning Desire (writers: Marlon Jackson, Tito Jackson / arrangements: Marlon Jackson, John Barnes)
Be Your Friend (writers: Betty Wright, John Barnes, Marlon Jackson / background vocal arrangement: Betty Wright, Margaret Reynolds, Marlon Jackson / rhythm arrangement: John Barnes, Marlon Jackson)
I Promise You (rhythm arrangement: Jack Daugherty, Marlon Jackson / lead vocal: Marlon Jackson)
Special Love (writers: Jackie Jackson, Marlon Jackson, Randy Jackson, Tito Jackson / arrangements: Betty Wright, Marlon Jackson, John Barnes)
Show Me (arrangements: Donald Kinsey, John Barnes, Marlon Jackson)
Gimme Just Another Try (writers: Betty Wright, John Barnes, Marlon Jackson)

Tito played guitar on 2 songs (Give A Smile, Make Me Love The Rain) from Betty Wright's 1981 self titled album. Betty does background vocals on Cruisin’ from Tito's 2016 solo album Tito Time.

Janet with Blackstreet

Girlfriend/Boyfriend feat. Eve & Ja Rule (from 1999's Finally) / I Get Lonely (TNT Remix - 1998)

Teddy Riley remixed Go Deep (T.R. Funk Mix)

Teddy also produced & co-wrote 2 songs from The Jacksons 1989 album 2300 Jackson Street

She / 2300 Jackson Street

Jermaine with Babyface & Color Me Badd - Treat You Right (from 1991's You Said)

Jermaine sings with Rita Coolidge on We've Got Tonite from her 1983 album Never Let You Go. That song was first released by Bob Seger in 1978 (as We've Got Tonight) and became a hit by Kenny Rogers & Sheena Easton in 1983. Jermaine also does background vocals on Rita's 1983 song Shadow In The Night.

Rita & Jermaine wrote & sing Is It Always Gonna Be Like This on his 1981 album I Like Your Style. Rita does the rhythm arrangement. Jermaine produced it. It was remade by Raymond & Claudia in 1982

[Edited 6/29/18 18:16pm]

Mike does backgrounds on:

Joe King Carrasco & The Crowns - Don't Let A Woman (Make A Fool Out Of You) [from 1982's Synapse Gap (Mundo Total)]

Jackie co-wrote (with Jack Wargo & Pamela Phillips-Oland) and arranged Playin' With Fire from Greg Phillinganes' 1984 album Pulse. The song appeared on the soundtrack for the movie Touch And Go released in 1986. On the same album, Greg recorded Behind The Mask, which Mike wrote lyrics to a 1979 Yellow Magic Orchestra song of the same name. Mike does background vocals on Greg's version. Greg also played keyboards on Eric Clapton's version released in 1986 (on the LP August) & Mike's version released in 2010 (on Michael). Shanice Wilson does ad libs on Mike's version. Greg has played on songs by The Jacksons, Mike, Jermaine, Janet, & Marlon and has toured with the brothers.

MickyDolenz said:

Tpmp93 said:

I don't think Michael appears on LA is my Lady, it's a lookalike. However, LaToya makes a cameo appearance with Dean Martin.

The real Mike is standing with Frank around 2:50 of the video. You're probably talking about the gloved hand in the park. The body isn't shown, so that person does not really have to look like him.

Tito (with Vassal Benford) produced 2 songs on gospel singer Tramaine Hawkins' 1987 album Freedom.

Freedom (background vocals: Jackie Jackson, Jermaine Jackson, Randy Jackson, Tito Jackson / keyboards & digital synth: Tito Jackson, Vassal Benford)
Power (writers: David Ritz, Tito Jackson, Vassal Benford / guitar: Tito Jackson / digital synth: Tito Jackson, Vassal Benford)

It's interesting that both Randy Jacksons worked on this album, the one from The Jacksons & the one who was later on American Idol, who played bass on another song

Finished Touch - New Frontiers (writers: Jermaine Jackson, Maureen Bailey, Michael McGloiry / bass: Jermaine Jackson)

This song is from the 1978 album Need To Know You Better

Ralph Tresvant - Alright Now (writers: John Barnes, Michael Jackson) (from 1990 self-titled album)
Luther Vandross & Janet Jackson feat. BBD & Ralph Tresvant - The Best Things In Life Are Free (from 1992 Mo' Money soundtrack)

I believe Alright Now was originally written and recorded by MJ and Barnes as far back as 1983.

2016 Soul Train Awards

Brothers Johnson - This Had To Be (writers: Michael Jackson, Louis Johnson, George Johnson)
Mike did background vocals on this song from their 1980 album Light Up The Night.

Stevie Wonder - All I Do (background vocals: Betty Wright, Walter Williams, Eddie Levert, Michael Jackson, Jamil Raheem)

This is from Stevie's 1980 album Hotter Than July. He originally wrote this song for Tammi Terrell, who recorded it in 1966. Her version was titled All I Do Is Think About You. The Jackson 5 sang background on You Haven't Done Nothin' from Stevie's 1974 LP Fulfillingness' First Finale. Around this time, Stevie produced a few songs for the J5, that weren't released at the time. One of the songs (You're Supposed To Keep Your Love For Me) was re-recorded for Jermaine's 1980 album Let's Get Serious. Another song from the J5 sessions called Buttercup, was recorded by Carl Anderson and released on his 1986 self-titled album. The J5 version was released in 2009 on I Want You Back! Unreleased Masters, but the other J5/Stevie songs are still unreleased. Stevie produced & played instruments on 2 other songs from Let's Get Serious (Let's Get Serious, Where Are You Now). Stevie wrote Let's Get Serious and co-wrote Where Are You Now with his sister Renee Hardaway. Stevie also co-wrote I Think It's Love with Jermaine & Michael Omartian, which was on Jermaine's 1986 album Precious Moments.

Stevie Wonder & Michael Jackson - Get It / Just Good Friends

Get It was released on Stevie's 1987 album Characters and Just Good Friends on Mike's 1987 album Bad. Stevie wrote I Can't Help It with Susaye Greene, who was a member of The Supremes in the 1970s. It came out on 1979s Off The Wall.

Jermaine with Pia Zadora

Mac & Jack

Paul McCartney gave Girlfriend to Mike which was released in 1979 on Off The Wall, which omitted some of the lyrics from Wings' version on 1978's London Town

They recorded 3 songs together, The Girl Is Mine on 1982's Thriller & The Man / Say Say Say on Paul's 1983 album Pipes Of Peace. Paul & Mike wrote both songs on Paul's album. They both sang on Yeah (posted earlier in the thread) which was on the 1992 album Love's Alright by Eddie Murphy. Yeah also features Stevie Wonder, Luther Vandross, & Howard Hewett. Howard did backgrounds on PYT from Thriller, 3 songs from Janet's 1982 debut album (Don't Mess Up This Good Thing, Forever Yours, Come Give Your Love To Me), Heart Don't Lie from LaToya's 1984 album of the same name, and the song Jackie wrote/produced (Playin' With Fire) for Greg Phillinganes. Phillip Ingram (from Switch) & his brother James (wrote PYT with Quincy Jones) are the other background singers on Playin' With Fire. Howard wrote Frustration (on the same Heart Don't Lie album) with Chuck Gentry and produced it with Amir Bayyan. Howard Hewett, Mike, Stevie Wonder & James Ingram are part of the choir on State Of Independence from Donna Summer's 1982 self-titled album. On a related note, Howard's fellow member from Shalamar, Jeffrey Daniel, was in Mike's Bad & Smooth Criminal videos and Paul McCartney's 1984 movie Give My Regards To Broad Street during the Silly Love Songs part.

LaToya Jackson feat. Howard Hewett - Heart Don't Lie (1984)

Rebbie released a duet with Robin Zander, who is the lead singer of Cheap Trick. The song (You Send The Rain Away) was on her 1986 album called Reaction.

Jermaine wrote Come To Me with Don Daniels & Kathy Wakefield. Thelma Houston released it on her 1976 album Any Way You Like It

Mike sang on Carole Bayer Sager's song Just Friends on her 1981 album Sometimes Late At Night. He recorded a song Carole wrote with David Foster (It's The Falling In Love) on Off The Wall. Carole released her version (with Michael McDonald on background) in 1978 on ...Too. Mike's 1979 version is a duet with Patti Austin. Patti remade a song (Let It Ride written by Jermaine, Gregory Williams {Switch}, & Michael McGloiry) from Jermaine's 1978 album Frontiers on her 1979 album Live At The Bottom Line. Patti also released Give It Up (written by Mike & Randy on Triumph from 1980) in 2011 on her album Sound Advice. Couldn't find the studio version on Youtube, but there's a 2014 concert video.

Jermaine sang on The Real Deal from the 1996 album of the same name by Edgar Winter

MickyDolenz said:

Brothers Johnson - This Had To Be (writers: Michael Jackson, Louis Johnson, George Johnson)
Mike did background vocals on this song from their 1980 album Light Up The Night.

Was basically a "Thank You" from MJ for Get On The Floor. MJ wrote some of it, you can tell.

Wow MickyDolenz! This is such a well researched thread. I'm going to bookmark it for future reference. Thanks for your effort and input!

Jermaine Jackson & Theresa Rhodes ‎- Save Tomorrow {1995}

Herb Alpert feat Janet Jackson - Diamonds (1987)

Making Love In the Rain (1987) Herb Alpert feat Lisa Keith & Janet Jackson

Eaten Alive (1985) Diana Ross feat Michael Jackson and Barry Gibb