Today is a somber anniversary: It’s been 50 years since the systematic killing of roughly 1.7 million Cambodians began under the Khmer Rouge. The genocide included the slaughter of intellectuals and artists. Music, in particular, was targeted by the regime. Sovann Khon, who survived the brutality, now teaches and plays Cambodian music in Lowell, Massachusetts. He tells The World’s Host Carolyn Beeler how performing saved his life.