It is common in Balinese gamelan that instruments are played in pairs which are tuned slightly apart so as to produce interference beating which are ideally at a consistent speed for all pairs of notes in all registers. It is thought that this contributes to the very "busy" and "shimmering" sound of gamelan ensembles. In the religious ceremonies that contain Gamelan, these interference beats are meant to give the listener a feeling of a god's presence or a stepping stone to a meditative state.
http://en.wikipedia.org/wiki/Gamelan#Tuning
Information about the tunings used:
Pelog
Slendro
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