As the singer/songwriter for the Velvet Underground, Lou Reed was instrumental in creating a visceral, avant-garde sound that many indie bands still emulate today. During his prolific solo career, the rock legend has consistently reinvented himself. Not too long ago, art star and self-made auteur Julian Schnabel approached him about filming a live performance of his 1973 concept album, Berlin, a bleak, Kurt Weill-inspired opus about the downward spiral of a drug addict named Caroline. Schnabel shot the documentary at St. Ann's Warehouse in Brooklyn over four nights last December, with guest musicians such as Steve Hunter and Antony (of Antony and the Johnsons), plus a movie backdrop created by Schnabel's daughter Lola and an impressionistic film by Alejandro Garmendia. Tonight, the Colony Theater exclusively screens the documentary.