This document provides an overview of the music traditions of Cambodia, Indonesia, and Myanmar. It discusses the historical background and concepts of Cambodian music, including the Khmer kingdom of Angkor and musical ensembles like the pinpeat and piphat. It also summarizes key aspects of Indonesian music traditions such as the gamelan orchestra and scales like slendro and peloq. Finally, it briefly mentions that the early civilizations in Myanmar date back to the 1st century.