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| Indonesian slendro | |
|---|---|
| Name | Slendro |
| Region | Indonesia |
| Family | Austronesian musical traditions |
| Typical instruments | Gamelan, Siter, Kendang, Bonang |
| Related | Pelog, Gamelan degung, Gamelan gamal |
Indonesian slendro is a five-tone pentatonic tuning system central to Indonesian Gamelan ensembles and Austronesian musical practice across the Indonesian archipelago. It underpins repertories associated with Javanese courts such as Yogyakarta Sultanate and Surakarta Sunanate, Balinese temple rites of Pura Besakih and secular dance-theater linked to troupes like Wayang Kulit companies. Slendro functions as both a scale and a flexible tuning tradition that interacts with instruments, regional courts, and colonial and postcolonial institutions including Dutch East Indies archives and ethnomusicology departments at Leiden University and University of Cologne.
Slendro serves as one of the principal tuning systems alongside Pelog. It is practiced in contexts ranging from royal Kraton Yogyakarta ceremonies to Balinese temple festivals at Ubud Royal Palace, and in maritime trading hubs such as Aceh and Makassar. Ethnomusicologists like Jaap Kunst and Mantle Hood contributed analyses while fieldworkers from Smithsonian Institution and British Museum recorded repertoires, linking slendro to collections in institutions such as Rijksmuseum and Musée de l'Homme. Colonial-era interactions with administrators like Stamford Raffles and scholars such as Hendrikus de Winkel influenced documentation efforts.
The slendro tuning is approximated as a five-note equidistant scale but varies by locale and ensemble, producing debates in writings by Colin McPhee and Richard Pickford. Measurements by researchers at Institut Teknologi Bandung and teams associated with British Library sound archives show that slendro degrees do not map neatly onto equal temperament used in Royal Academy of Music curricula or western concert pitch standards like A=440 Hz. Luthiers and metallurgists in workshops linked to Kraton Surakarta and factories in Central Java craft gongs and saron keyed to slendro intervals; acousticians at Massachusetts Institute of Technology and University of Oxford have modeled partials and inharmonicity for these instruments. Comparative work with Southeast Asian systems, studied by scholars at Cornell University and Australian National University, situates slendro among Austronesian tunings recorded in archives of Peabody Museum and Muséum national d'Histoire naturelle.
Distinct slendro variants exist in Java, Bali, Lombok, and Sunda (West Java) with courtly styles in Surakarta Sunanate and Yogyakarta Sultanate contrasted against Balinese kecak and gamelan angklung practices from Gamelan Semar Pegulingan. Sundanese degung ensembles of Bandung and gamelan gong kebyar of Denpasar exemplify local adaptations. Colonial photographers and ethnographers affiliated with Royal Anthropological Institute documented rituals at Prambanan and Borobudur that include slendro-based music; later preservation efforts involved organizations such as UNESCO and national bodies like Direktorat Jenderal Kebudayaan.
Instruments tuned to slendro include metallophones like saron and gender, gong families such as gong ageng and kempul, stringed instruments like the rebab, and percussive drums such as kendang, used in ensembles at Kraton Pakualaman and Balinese temples. Performance roles are codified in court manuals and theatrical forms including Wayang Kulit, Wayang Wong, and Topeng. Notable ensembles and practitioners associated with slendro include royal gamelan at Sultanate of Yogyakarta, Balinese maestros in Bali Dinas Kebudayaan, and modern ensembles connected to Institut Seni Indonesia and conservatories like Conservatorium van Amsterdam. Recording projects by labels such as Nonesuch Records and archives at Hindustani Music Archive have preserved slendro performances.
Slendro’s history intersects with the rise of Hindu-Buddhist kingdoms such as Majapahit and Srivijaya, the standardization efforts under court authorities in Mataram Sultanate, and shifts during the Dutch East Indies colonial period. Transmission occurred through palace patronage, temple cults at sites like Pura Luhur Uluwatu, and itinerant musicians documented by travelers including Marco Polo and later ethnographers like Walter Spies. Post-independence cultural policies under figures such as Sukarno and institutions like Sekolah Tinggi Seni Indonesia affected repertoire codification and international presentations at events like the Festival of Indonesia.
Slendro underlies ritualized court ceremonies, temple offerings, dance dramas, and social functions including weddings and harvest rites in communities from Central Java to Bali. It carries associations with hierarchy in kraton etiquette, with repertories tied to historical narratives recorded in chronicles such as the Babad Tanah Jawi. Cultural agencies including Taman Mini Indonesia Indah and NGOs promoting intangible heritage collaborate with international bodies like UNESCO to safeguard slendro-bearing practices. Tourism sectors in Yogyakarta and Ubud leverage slendro performances for cultural presentations at venues including Prambanan Ramayana Ballet.
Contemporary composers and researchers integrate slendro into collaborations with Western ensembles and electronic music studios at institutions like IRCAM and Stanford University’s Center for Computer Research in Music and Acoustics. Cross-cultural projects have involved artists such as I Nyoman Windha and scholars from Harvard University and University of California, Berkeley conducting spectral analysis, notation experiments, and revitalization programs. Ethnomusicological conferences hosted by Society for Ethnomusicology and digitization projects at British Library Sound Archive and National Library of Indonesia continue to broaden access and provoke debates about authenticity, preservation, and innovation.
Category:Indonesian music