The director has said that he "loves" working with recording artists and pushing their limits on the silver screen.
Daniels told Rolling Stone: "From my first film, Monster’s Ball, with Puffy and Mos Def to Macy Gray in Shadowboxer, Eve in The Woodsman with Kevin Bacon, a musician has been in every film I’ve done."
As for Carey's role in the new movie Precious, Daniels has said that he knew his friend always "had the chops" for it.
He said: "Because we’d just finished working together in a film. It’s called Tennessee, by a Canadian director Aaron Woodley, a little tiny movie and she starred in it for me. We became really good friends and I knew that she had the chops.
"She does an incredible impersonation of Aretha Franklin. Not her singing voice but her speaking voice! She channels people’s voices."