Vocal music features singing while instrumental music uses only instruments. The document then provides information about the traditional music of several Southeast Asian countries. It notes that Cambodian court music is similar to Java's and features large orchestras with gongs and struck keys. It also describes the popular Gamelan orchestras of Indonesia and their regional variations in Bali and Java. The document gives brief overviews of the traditional music of Myanmar, Thailand, Laos, and Cambodia, including descriptions of various folk and court ensembles.