─ 13 ─slightly shifting the pitch of the corresponding ve keys, creating interference beats. Pemade and Kantilan in the full set of Gamelan Pelegongan may have the cross-sectional surface of keys in a semicylindrical shape (the cross-sectional surface of keys is usually in a trapezoidal shape), called Jongkok (Fig.4). There are four of them, respectively. However, existing old Gamelan Pelegongan often includes four Pemades and four Kantilans where metallophones with keys in a trapezoidal shape and semicylindrical shape are mixed.A key with a higher pitch (Pengisep) is made rst, and then one with a lower pitch (Pengumbang) is adjusted and made by hearing the interference beats with the first key as the reference.Therefore, the Pengisep key that becomes a reference is analyzed to compare the pitches of each set.The 5-tone pelog scale of Gamelan used in Bali is indicated in Fig.5. The characters in the middle line are letter notations traditionally used in Bali and their pronunciation is indicated on the top by using alphabet. The numbers on the bottom are numerical notations used at a college of music, etc., indicating the pelog scale of Gamelan Pelegongan has five tones including the 1st, 2nd, 3rd, 5th and 6th of seven tones. The numerical notations in Fig.5 are used in this report.4. Gamelan Pelegongan to be measuredThere are 11 sets of Gamelan Pelegongan for measurement, and all of them are in the southern part of Bali. This seems to be because Legong dance and Barong dance originated in the southern part of Bali. Details are explained in the following.4.1 Set ASet A of Gamelan Pelegongan is owned by ISI (Institute Seni Indonesia Denpasar) in Bali (Fig.1). It was made around 1990 and is exhibited in the museum of the Institute. I Wayan Beratha who was a performer and a Gamelan maker at the same time made and tuned it. Gender Rambat has 14 keys. Measurement was conducted in 2013.4.2 Set BSet B of Gamelan Pelegongan is owned by Banjar (village) Blah Kiuh in Kabupaten (region) Gianyar. This instrument is Gamelan Bebarongan used to accompany Barong dance. The time of production is uncertain, but according to local performers, it seemed to have existed before 1950. Gender Rambat has 13 keys. Measurement was conducted in 2014.4.3 Set CSet C of Gamelan is owned by Banjar Abian Nangka Kaja in Denpasar. It was modified to Gamelan Gong Kebyar around 1946. Since there is a record of participation in the festival in Surabaya as Gamelan Pelegongan in 1936 and it was modied to Gamelan Gong Kebyar to match the pitch of Gender Rambat that existed in those days, it was measured as Gamelan Pelegongan. Rangda (witch) appears at the end of Legong dance accompanied by this Gamelan. Gender Rambat has 14 keys. Measurement was conducted in 2017.4.4 Set DSet D of Gamelan Pelegongan is owned by Banjar Meranggi in Denpasar. This instrument is used to accompany Legong dance similar to Set C. The time of production is uncertain; however it might have been made around 1935 because the Kumpur stand has the engraving of “1935” (Fig.6). Gender Rambat has 13 keys. Measurement was conducted in 2017.Fig.4 JongkokFig.5 Pitch name for GamelanFig.6 Kempul stand for Meranggi
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