Gamelan is the traditional ensemble music of the Javanese, Sundanese, and Balinese peoples of Indonesia, made up predominantly of percussive instruments. The most common instruments used are metallophones and a set of hand-drums called kendang, which keep the beat. The kemanak, a banana-shaped idiophone, and the gangsa, another metallophone, are also commonly used gamelan instruments on Bali. Other notable instruments include xylophones, bamboo flutes, a bowed string instrument called a rebab, and a zither-like instrument called a siter, used in Javanese gamelan. Additionally, vocalists may be featured, being referred to as sindhen for females or gerong for males.

The rebab is the name of several related string instruments that independently spread via Islamic trading routes over much of North Africa, Middle East, Central Asia, Southeast Asia, and parts of Europe. The instrument is typically bowed, but is sometimes plucked. It is one of the earliest known bowed instruments, named no later than the 8th century, and is the parent of many bowed and stringed instruments.