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 Bali, remarked, "Deviations in what is considered the same scale are so large that one might with reason state that there are as many scales as there are gamelans." This view is contested, however, by some teachers of gamelan, and there have been efforts to combine multiple ensembles and tuning structures into one gamelan to ease transportation at festival time. One such ensemble is gamelan "Manikasanti", which can play the repertoire of many different ensembles. Balinese gamelan instruments are built in pairs that are tuned slightly apart to produce interference beats, ideally at a consistent speed for all pairs of