Gamelan gong kebyar
Balinese gamelan Lila Cita, (the name refers to both the gamelan and the group) is a gong kebyar, the most popular form of gamelan in Bali today.
Kebyar is usually translated as 'bursting open' and gong kebyar burst upon the Balinese gamelan scene 1915. The instruments have five tones.
The instruments include a number of gangsa (at the back left of the picture) of different sizes. They have bronze keys, suspended over bamboo resonators and are struck with wooden mallets.
The larger of these instruments (jegog and calung) play the basic melody. The smaller gangsa play kotekan - rapid interlocking patterns.
These consist of two parts polos (plain) and sangsih (differing). The picture also shows the reyong (gong chimes) and the gongs.
The ensemble is led by two drums, playing interlocking patterns. All the metallophones are tuned in pairs, to the same pitch, but one of each pair is tuned slightly higher than the other.
This results in the shimmering sound which is characteristic of Balinese gamelan. The gongs and drums are also tuned in pairs wadon (female) and lanang (male).
Resource link http://www.gamelannetwork.co.uk/balinese-gamelan.html