CELEMPUNG

The siter and celempung are plucked string instruments used in Javanese gamelan. They are related to the kacapi used in Sundanese gamelan.
The siter and celempung each have between 11 and 13 pairs of strings, strung on each side, between a box resonator. Typically the strings on one side tuned to pélog and the other to slendro. The siter is generally about a foot long and fits in a box (which it is set upon while played), while the celempung is about three feet long and sits on four legs, and is tuned one octave below the siter. They are used as one of the elaborating instruments (panerusan), that play cengkok (melodic patterns based on the balungan). Both the siter and celempung play at the same speed as the gambang (which is rapidly).
The name "siter" comes from the Dutch word "citer", which corresponds to the English word "zither". "Celempung" is related to the Sundanese musical form celempungan.
The strings of the siter are played with the thumbnails, while the fingers are used to dampen the strings when the next one is hit, as is typical with instruments in the gamelan. The fingers of both hands are used for the damping, with the right hand below the strings and the left hand above them.
Siters and celempung of various sizes are the characteristic instrument in Gamelan Siteran, although they are used in many other varieties of gamelan as well.

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GONG AGENG

The gong ageng (Kromo Javanese meaning large gong, ngoko is gong gedhe) is a musical instrument. It is the largest of the bronze gongs in the Javanese and Balinese gamelan orchestra and the only large gong that is called gong in Javanese. Unlike the more famous Chinese or Turkish tam-tams, Indonesian gongs have fixed, focused pitch, and are dissimilar to the familiar crash cymbal sound. It is circular, with a conical, tapering base of diameter smaller than gong face, with a protruding polished boss where it is struck by a padded mallet. Gongs with diameter as large as 135 centimeters (54 inches) have been created in the past, but gongs larger than about 80 centimeters (32 inches) are more common especially to suit the budget of educational institutions.
There is at least one large gong in each gamelan, but two are common and older gamelans may have three or more. The gong ageng usually has its own name, which may be bestow upon the entire set of instruments. The gong ageng is considered the most important instrument in a gamelan ensemble: the soul or spirit of the gamelan is said to live in it. Gong ageng are often proffered ritual offerings of flowers, food, and/or and incense before performances or each Thursday evening to appease spirits believed to live in and around it.
Commonly, less expensive iron gong ageng or a slit-type gong are made to fulfill the role of the bronze gong, though at the loss of sound quality- for poorer regions and villages. The cost of expertly pure cast & beaten bronze has seen a rise in bronze-plated and bronze-laminated iron gongs created for the undiscerning expatriate.

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