Some people judge potential new acquaintances based on the books they say they love. Others judge new friends and, let’s be honest, old friends, by their record collections. Director Jason Blackmore experiments with this premise by asking underground musicians like Jello Biafra, Keith Morris, and John Reis to reveal their music libraries to him. The result is a series of conversations that touch on bygone record stores, favorite albums (be it Sgt. Pepper or an obscure 7-inch), and the first time these musicians heard the albums that changed their lives. Where better to screen Blackmore’s exploration of personal music history than backstage at the Black Cat? The film shows at 8 p.m. at the Black Cat Backstage, 1811 14th St. NW. $7. (202) 667-4490.