A new documentary on Robert Christgau, The Last Critic , will premiere at SXSW Film Festival this March. Randy Newman , Boots Riley , and Village Voice writer-turned-novelist Colson Whitehead have signed up to tell the story of the self-appointed Dean of American Rock Critics. Naturally, having penned “ I Killed Christgau With My Big Fucking Dick ,” Sonic Youth ’s Thurston Moore also chips in to help immortalize his onetime foe. Matty Wishnow directed the doc, which features music from Newman,