Michael Jackson could have appeared on a song called "Thug Nature" from Tupac's The Don Killuminati: The 7 Day Theory according to producer QD3 who produced "To Live And Die In L.A." from the same album.

The producer and son of legendary producer and arranger Quincy Jones revealed in BET's oral history of The Don Killuminati... that Tupac's camp reached out to Michael for a collaboration, but he declined out of loyalty to the Notorious B.I.G., who he recorded "This Time Around" with a year before.

"So I set up a meeting at Neverland, I go up there and you know what Michael says? He liked Biggie," revealed QD3, who worked with director Allen Hughes on the upcoming FX docuseries, Dear Mama, which chronicles Tupac's relationship with his mother, former Black Panther Afeni Shakur.

The producer further explained Pac's beat-picking process and how he liked to work in the studio.

"Pac would take all my beats including the ones I would never play for people. I learned a lesson that you gotta be spontaneous more, and he taught me how to just think and just do it," QD3 said. "Pac would get irritated when you fumbled with sounds, almost like you were disrespecting his time a little bit."

"Thug Nature," which uses an interpolation of Michael Jackson's hit "Human Nature," didn't make it onto The Don Killuminati..., but appeared on the 2000 Death Row compilation Too Gangsta For Radio, as well as other posthumous Tupac albums.

Check it out above, and "This time Around" below.