Retribution Gospel Choir serves as the perfect outlet for Low’s Alan Sparhawk to vent his loud, jamming side. Unlike Low, where everything is turned to muted colors, RGC (which is Low with drummer Eric Pollard filling in for Mimi Parker) specialize in a cathartic guitar pop where feedback is just a note away. Among the shiny six- string attacks rest harmonies that rise and fall like waves crashing to shore. “Your Bird” is heavenly in its balance between Sparhawk’s pop aspirations and his grunge-like thrust. “Workin’ Hard” channels a churning, working-class rock. “Poor Man’s Daughter” recalls the minor-key epics of the early-‘70s prog movement until it climaxes with a guitar whirlwind worthy of Sonic Youth. “’68 Comeback” and “The Last of the Blue Dream” are brief instrumental interludes gone with the flick of a guitar pick. “White Wolf” shades towards a darker side of Foo Fighter’s punk-pop. “Electric Guitar” serves up eight minutes of crushing stoner-rock. “Bless Us All’ ends things on an atmospheric note.