The document discusses the music of Southeast Asia, which includes 11 countries in the subregion. It provides an overview of traditional music styles in Southeast Asia, which vary greatly across the different ethnic and cultural groups. Some of the main musical genres include court music, folk music, and styles of smaller ethnic groups. Gamelan orchestras from Indonesia, Piphat/Pinpeat ensembles from Thailand and Cambodia, and Kulintang ensembles from parts of the Philippines, Borneo, Sulawesi and Timor are three of the main musical styles that have influenced others in the region. The document also lists some common instruments used in Southeast Asian music, such as string instruments, gongs, flutes, and bagpipes