With their upcoming musical feature film on its way, rap duo OutKast are set to release the film's soundtrack, Idlewild, on December 6th.

"It's like an OutKast record on film," Big Boi says of the movie, with the same tentative title. Set in the Depression-era South, the film, which will be released in theaters on January 6th, follows the story of a struggling musician (played by Andre 3000) and a lovable Lothario (Big Boi).

"Since it's in the Thirties, we didn't want to use too many synthesizers and keys," says Big, who adds that the duo mined its vault of unreleased and unfinished tracks for the album.

The first single, "Idlewild Blues," is a jazzy romp loaded with drum stomps, muffled trumpets and piano; Dre gives his best Cab Calloway impersonation, and Big flips his hallmark spitfire rhymes. "It's a juke-joint jam," says Big. "I don't know if you can categorize it as a rap song."

MORE AT ROLLING STONE