Check out our The Notorious B.I.G. section for more posts about The Notorious B.I.G..'s Simon Vozick-Levinson spoke with Wayne Barrow, Biggie's former manager and a producer on "Notorious."

Wayne Barrow tells EW that several legendary unheard demo tapes from early in Biggie's career form the heart of the soundtrack: "We kept everything as is, in its raw form. This is what got him the [recording] deal, plain and simple. His fans have been asking for it for years."

In addition, Barrow said that Biggie's son C.J. will be featured on an "emotional remix" to "One More Chance." MTV News spoke to a "source close to the Wallace family," who told them that C.J. will be rapping with his dad on the track.