Gamelan are Indonesian traditional music instruments. They are used in shadow puppet performances and are very sacred especially in Java, where Gamelan used to only be owned by the royal family and chief of villages.
"A gamelan is a kind of musical ensemble of Indonesian origin typically featuring a variety of instruments such as metallophones, xylophones, drums, and gongs; bamboo flutes, bowed and plucked strings, and vocalists may also be included. The term refers more to the set of instruments than the players of those instruments. A gamelan as a set of instruments is a distinct entity, built and tuned to stay together — instruments from different gamelan are not interchangeable.