50 Cent Producing Docuseries About Tekashi 6ix9ine, Other Celebs

50 Cent is producing a new docuseries covering a wide range of celebs ... and the most interesting story on the docket is the rise and fall of Tekashi 6ix9ine.

Production sources tell TMZ ... Fiddy's scripted series will focus on Tekashi, Snoop Dogg, music producer Scott Storch, former NBA stud Rafer Alston and 50 himself.

The docuseries is called "A Moment in Time" ... and it will have 6 to 8 hour-long episodes dedicated to each subject. The project will be produced through 50's G-Unit Film & Television company.

Our sources say 50 is framing Tekashi's story around his brief but controversial rap career. As you know, 69 rose to fame by incorporating the Nine Trey Bloods gang into his music, only to be busted by the feds and turn into a snitch.

As we reported ... there were rumblings about 50 snagging movie rights for Tekashi ... and now we know it'll be part of the scripted series.

Our sources say Snoop Dogg's episodes will focus on his murder trial, which happened at the same time he had the highest-selling hip-hop album in the country, "Doggystyle."

Rafer's tale is about his journey from streetball legend to the 2009 NBA Finals with the Orlando Magic. Storch's story highlights his dynamic career as one of music's most high-profile producers.

And, the 50 Cent-focused eps include the making of his album, "The Massacre," and his beef with Jimmy Henchman.

Getcha popcorn ready.