Gamelan is an instrumental ensemble including metallophones, xylophones, drums gongs, bamboo flutes, and plucked strings. In Indonesia, gamelan usually accompanies dance wayang puppet performances, such as the 3.14 Company’s 2001 Wayang Tempest production, rituals, or ceremonies. There are several different tuning systems associated with Gamelan, and each orchestra may include instruments tuned in several different systems. The music is improvised and tonal, featuring complex harmonies and rhythms.

Sources Cited:
Wikipedia

Productions:
Wayang Tempest, The Tempest, 2001, 3.14 Company, dir. Roger Jenkins