Actor Casey Affleck chronicle the musical career of Joaquin Phoenix behind the lens of a camera.

Affleck is directing a documentary feature on Phoenix, his friend and fellow actor who last spring decided to quit acting for a musical career.

Phoenix is embarking on a new path as a rapper, with an album to be produced by Sean Combs. He is scheduled to make his first public performance Friday at a Las Vegas club, which will officially kick off Affleck’s shoot.

Affleck has recently appeared in “Gone Baby Gone” and the “Ocean’s Eleven” series. He directed a series of shorts for Sundance Channel in the late 1990s.