Gamelan with male groups. In the twenty-five countries outside Indonesia that have gamelan, music performed in a concert context or as part of ceremonies for expat communities may also accompany dance or "wayang". The tuning and construction of a gamelan orchestra is a complex process. Javanese gamelan use two tuning systems: "sléndro" and "pélog". There are other tuning systems such as "degung" (exclusive to Sunda, or West Java), and "madenda" (also known as "diatonis", similar to a European natural minor scale). In central Javanese gamelan, "sléndro" is a system with five notes to the octave, with large intervals, while "pélog" has
Gamelan outside Indonesia style steel slendro pelog gamelan, and a Javanese slendro bronce gamelan, both owned by the Embassy of Indonesia in Mexico City; and gamelan Asep Mangsa, a Javanese pelog gamelan, and gamelan Barudak, a Sundanese degung gamelan, both owned by Indra Swara. The first gamelans outside of Indonesia were in the Netherlands, the country which had colonized the islands. Before World War II, the Javanese dancer Jodjana had a small gamelan group in the Netherlands, which accompanied his performances. He had to train Dutch musicians. Early during the war, the resistance fighter Bernardus IJzerdraat was killed by the Germans. His son