Nov. 22, 1963, is a day that lives in infamy. Not just because it was the day JFK was shot, but because it provides the group name for the lone star behind the Grassy Knoll. Like the blurry image of a supposed sniper, Bob Green’s second album, Positive, provides gauzy glimpses into something dangerous. The songs’ compendiums of stray bits of hiphop, funk, electric jazz, and wailing rock recount the conspiracies held in their titles: “Another Theory,” “Black Helicopters,” and “Roswell Crash.” Unfortunately, like the work of theorists who make their assumptions from the far reaches of reason, much of Positive sounds too contrived. But live, the intersection of real-time playing and Green’s “Wailing and Gnashing of Teeth” sound effects should provide enough conviction to convince even the biggest skeptics. At 8 p.m. at State of the Union, 1357 U St. NW. $7. (202) 588-8810.