Joaquin Phoenix documentary to track budding rap career

Whether Joaquin Phoenix's rap career is successful (or goes down in, wait for it, a ring of fire!) the whole episode will be recorded for posterity in a documentary shot by Casey Affleck.

Filming for the project began with Phoenix's first live performance in a Las Vegas lounge Jan. 16. Phoenixannounced that he would never make another film last spring and said that he would instead focus on making music.