The Don Killuminati: The 7 Day Theory was 2Pac's first posthumous album and the last 2Pac album with any of his creative output.

In BET's new oral history of the album, we learn the project's producer, Quincy Jones III [the son of the legendary Quincy Jones], wanted Michael Jackson to get on the track 'Thug Nature," which ultimately didn't make the album.

However, The King of Pop turned Pac's team down.

Why?

He had worked with 2Pac's rival the Notorious B.I.G. on "This Time Around” and remained loyal to the late Big.

"So I set up a meeting at Neverland,” said Jones III. “I go up there and told Michael about it. And do you know what Micheal said? He liked Biggie.”

What would the music game be like if Pac, Biggie, and MJ were still alive?