It was a night of long band names at the Black Cat’s Backstage on Thursday, with Missouri’s Someone Still Loves You Boris Yeltsin and Chicago’s Chin Up Chin Up. We’ve written about both bands before, and the place was sold out, something we don’t see too often, aside from Beck. Statisticians would argue that us writing about them –> sold out show is not a causal relationship, but we’re glad both bands are getting some…