Cambodian popular music is performed with western style instruments or a mixture of traditional and western instruments. Dance music is composed in particular styles for social dances. The music of crooner Sinn Sisamouth, Ros Sereysothea, and Pen Ran from the 1960s to the 1970s is considered to be the classic pop music of Cambodia. During the Khmer Rouge Revolution, many classic and popular singers of the 1960s and 1970s were murdered, starved to death, or overwork to death by the Khmer Rouge. and many original master tapes from the period were lost or destroyed.