Metalachi is a name that really flows off the tongue. Hailing from California via Chihuahua, the group combines the disparate worlds of Spinal Tap and Cheech and Chong into a strange hybrid of star-crossed genres. Since departing the fluorescent stage of America's Got Talent, Metalachi has built a sprawling fanbase with famous followers ranging from Howard Stern to the thrashing gods of Slayer. Listeners torn between a simultaneous craving for metal and mariachi, rest assured – there's no reason to be indecisive anymore. Metalachi has all the bases covered. (Just take a gander at the band's rollicking cover of Ozzy Osbourne's "Crazy Train.") 10pm, $15-20, The Rock Box, 1223 E. Houston