The bass savant producers in the Low End Theory scene are better known for moving hips than hearts, but at this concert — a benefit for tsunami and earthquake relief in Japan — founder Daddy Kev, Nobody, Gaslamp Killer and guests will spin to help the country recover. All door proceeds go to the Japanese Red Cross Society. Echoplex, 1154 Glendale Blvd., L.A. 9 p.m. Thursday. $12. http://www.attheecho.com.