The first dating back to 1974, in which Wonder crafted and produced a Jackson 5 album, which was eventually shelved.
That same year, Michael and his brothers provided backing vocals to Wonder's hit "You Haven't Done Nothin'" from his parent album Fullfillingness' First Finale.
Both Wonder and Jackson were part of an all-star choir included on Donna Summer's 1982 single "State of Independence" and 1985's "We Are the World", which Jackson co-wrote and both singles produced by Quincy Jones.
Within a year, Jackson also did background vocal work on "All I Do" from Wonder's platinum-selling Hotter than July album.
Cash Box called it a "light dance tune, heavy on groove, low on fat" that is "exciting and accessible" and praised Wonder's "patented skipping base feel and percussive sound" and Jackson's singing.