Gamelan outside Indonesia Seni Tari Indonesia di Nederland ) plays Javanese Traditional Karawitan dan Dance. The Polish band - Warsaw Gamelan Group - is perhaps the only band in this part of Europe that plays Indonesian music. WGG specialises in music from central Java. There are two Javanese gamelans in Portugal, one in Lisbon, at Fundação do Oriente and another in Oporto at Casa da Música. Besides being used for traditional Javanese music, the gamelan at Casa da Musica has been at the centre of very innovative projects, including the development of a Robotic Gamelan. Inspired by the ideas of gamelan collective practice,
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