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
American gamelan East and West coasts. Following Murphy's model was Barbara Benary, who built the instruments still used today for Gamelan Son of Lion. On the West coast, the airline industry made aluminum affordable, and this became the material of choice for several gamelan builders. Daniel Schmidt, a composer-builder, built an ensemble called "The Berkeley Gamelan" (independent of the University of California, Berkeley) as well as the set of instruments that would develop into Gamelan Pacifica in Seattle. Paul Dresher also used aluminum. Harrison worked with John Cage in the 40s on percussion compositions with found metal objects, resulting in alternate scaled