The idea for the film began when American filmmaker John Pirozzi was in Cambodia filming '' City of Ghosts '' . He was given a copy of the album '' Cambodian Rocks '' , a collection of untitled and uncredited music by artists presumed killed under the Khmer Rouge , and began researching the stories of the artists . Cambodian-born artist and sociology professor LinDa Saphan acted as associate producer and lead researcher for the film . The film includes profiles of influential performers like Sinn Sisamouth , Ros Serey Sothea , Pen Ran , Baksey Cham Krong , Liev Tuk , Huoy Meas , Yol Aularong , Meas Samon , Pou Vannary , and several others , most of whom perished during the Khmer Rouge genocide , plus interviews with surviving performers like Sieng Vanthy and members of Drakkar . The film takes its title from a song by Sinn Sisamouth
Khmer Rouge genocide
Cambodian genocide
Don't Think I've Forgotten