The playwright Lauren Yee has a disarming way of probing political trauma; her play “The Great Leap” explored China’s Cultural Revolution through basketball. Her latest, “Cambodian Rock Band”—directed by Chay Yew, starting previews on Feb. 4, at the Pershing Square Signature Center—is the first work in Yee’s Signature Theatre residency. The story, of a father and a daughter grappling with the atrocities of the Khmer Rouge, is told through live rock music, including songs by the psychedelic-pop group Dengue Fever.