According to performer Joe Burt, who collaborated with Jackson and Mercury, this story took place in 1983. At the time, Queen was on a break, and Freddie Mercury decided to work on a solo album.
Freddie reached out to Michael because he wanted to record a joint track with him for the collection. Both musicians admired each other's work, and Mercury wanted to add more dance rhythms to his music, reports Nypost.

Source:
imdb.com
However, none of these collaborations made it to Freddie's debut solo album "Mr. Bad Guy," released on April 29, 1985. The reason for the fallout was an unexpected guest—Jackson's pet llama named Louie.
As a result, "There Must Be More to Life Than This" was released as a solo performance by Mercury, and "State of Shock" was recorded by Jackson with Mick Jagger. Later, in 2014, the original version of the track featuring Freddie's voice was included in the compilation "Queen Forever."Freddie Mercury"Dear, could you come over? You have to get me out of here, I'm recording with a llama."
Previously, we at zoomboola.com reported that a former police officer discovered unreleased Michael Jackson songs in San Fernando. What was recorded on the tapes—read in our article.