The Gamelan is the musical instruments. In the Javanese Wayang, these instruments nowadays consist of at least 15 different types, mostly made of bronze and generally of the percussion type, mostly made of bronze and generally of the percussion type; a small bamboo flute (suling), one or two horizontal drums on wooden stands (kendang), a two stringed violin-like instrument (rebab) and a wooden xylophone (gambang) are the non percussion and/or non-bronze musical instruments used to accompany a wayang purwa performance.
see also :
The Popular Art in Java
The Character in Wayang Figures
The Dalang
Gamelan Art Music - part 2
Gamelan Art Music - part3