Tonight, LA’s Dengue Fever and SF’s Secret Chiefs 3 combine forces to… well, it’s tough to predict. The former filter sublimely kitsch Cambodian folk into their tuneful psych pop, while the latter—who often feature Seattle avant-garde musicians like Eyvind Kang and Dave Abramson in their lineup—meld sonic elements from Arabic, Persian, and Indian cultures, plus those from metal, Morricone’s soundtracks, and electronica into mind-boggling fusions of aural mystique. Whatever the case, this matchup should spark fascinating world-music mutations. (Neumos, 925 E Pike St,, 9 pm, $17, 21+)