That caveat aside, the crew that hits Club Freedom Saturday night should offer dependable thrills for fans of Def Jux's earthy, brainy hip-hop, with short sets from Hangar 18, C-Rayz Walz and the Perceptionists, a new group featuring Boston diehards Mr. Lif and Akrobatik MCing over cuts by DJ Fakts One. But stay late for a headlining spot from hardworking Los Angeleno Murs, whose new album is a collaboration with producer 9th Wonder, a young North Carolinian who found himself in the pages of The Source and XXL last year thanks to an appearance on Jay-Z's The Black Album alongside industry heavyweights the Neptunes, Kanye West, and Just Blaze. On Murs 3:16: The 9th Edition, the rapper unloads psychologically complex appraisals of both gender and race wars over Wonder's distinctive swirl of classic-soul yelp and jeep-beat whomp.