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Gamelan is the traditional ensemble music of the Javanese, Sundanese, and Balinese peoples of Indonesia, made up predominantly of percussive instruments. The most common instruments used are metallophones played by mallets and a set of hand-played drums called kendhang/Kendang, which register the beat. The kemanak (a banana shaped idiophone) and gangsa (another metallophone) are commonly used gamelan instruments in Bali. Other instruments include xylophones, bamboo flutes, a bowed instrument called a rebab, a zither-like instrument siter (in Javanese ensemble) and vocalists named sindhen (Female) or gerong (Male).
Although the popularity of gamelan has declined since the introduction of pop music, gamelan is still commonly played in many traditional ceremonies and other modern activities in Indonesia, both at formal and informal events. Gamelan is played to accompany religious rituals, ceremonies, dance, dance-drama, traditional theater, wayang puppets theatre, singing, concerts, festivals, exhibitions, and many more. Many consider gamelan to be an integral part of Indonesian culture.

History
The gamelan predates the Hindu-Buddhist culture that dominated Indonesia in its earliest records and thus represents an indigenous art form of Indonesia.
In Javanese mythology, the gamelan was created by Sang Hyang Guru in Saka era 167 (c. AD 230), the god who ruled as king of all Java from a palace on the Maendra mountain in Medang Kamulan (now Mount Lawu). He needed a signal to summon the gods and thus invented the gong. For more complex messages, he invented two other gongs, thus forming the original gamelan set.
The instruments developed into their current form during the Majapahit Empire. According to the inscriptions and manuscripts (Nagarakretagama and Kakawin Sutasoma) dated from the Majapahit period, the kingdom even had a government office in charge of supervising the performing arts, including the gamelan. The arts office oversaw the construction of musical instruments, as well as scheduling performances at the court.
In Bali, there are several gamelan selonding that have existed since the 9th century during the Sri Kesari Warmadewa reign. Some words refer to gamelan selonding was found in some ancient Balinese inscriptions and manuscripts. Today, gamelan selonding is stored and preserved well in ancient temples of Bali. It is considered sacred and used for religious ceremony purposes, especially when the big ceremony is held. Gamelan Selonding is part of daily life and culture for some indigenous people in ancient villages such as Bungaya, Bugbug, Seraya, Tenganan Pegringsingan, Timbrah, Asak, Ngis, Bebandem, Besakih, and Selat in Karangasem Regency.

In the court of Java (Surakarta Sunanate and Yogyakarta Sultanate) the oldest known ensembles, Gamelan Munggang and Gamelan Kodok Ngorek, are apparently from the 12th century. These formed the basis of a "loud style" of music. These Gamelan are the oldest existing gamelan instruments and still preserved well in the courts. The Gamelans become the heirloom of the Javanese courts. Gamelan Kodhok Ngorek and Gamelan Monggang are sacred gamelan that will only be sounded for Javanese court ritual ceremonies such as the Sultan's Jumenengan (coronation ceremony), welcoming highly respected guests at the palace, royal weddings, and Garebeg. This gamelan is only owned by the court and the general public is not allowed to have a similar gamelan set.
A "soft style" developed out of the kemanak tradition and is related to the traditions of singing Javanese poetry, in a manner often believed to be similar to the chorus that accompanies the modern bedhaya dance. In the 17th century, these loud and soft styles mixed, and to a large extent, the variety of modern gamelan styles of Bali, Java, and Sunda resulted from different ways of mixing these elements. Thus, despite the seeming diversity of styles, many of the same theoretical concepts, instruments, and techniques are shared between the styles.

In the Sultanate of Cirebon, on the north coast of Java. The gamelan Sakati in the Keraton Kasepuhan is originated from Demak Sultanate in 1495 which was a gift from Sultan Trenggono of Demak for the marriage of Ratu Mas Nyawa (daughter of Raden Patah, king of Demak) to Prince Bratakelana (son of Sunan Gunung Jati from his wife Syarifah Bagdad). This gamelan is closely related to the early days of the spread of Islam by Wali Sanga in Java. At the Keraton Kasepuhan, the gamelan Sakati is played on the Idul Adha month of Hajj (Zulhijah) in the Sri Manganti building when the sultan and his relatives head to the Grand Mosque. This gamelan is kept in the Museum Pusaka Keraton Kasepuhan Cirebon.
In Lamongan, East Java, there is an ancient gamelan from the 15th century called Gamelan Singo Mengkok. This gamelan is a legacy of the Sunan Drajat (one of the Wali Sanga) which was used for broadcasting the Islamic religion in Paciran, Lamongan. Beaten by the Friends of Sunan Drajat to accompany the tembang Pangkur (panguri isine Qur'an) created by Sunan Drajat himself. This gamelan ensemble is an acculturation of Hindu-Buddhist and Islamic culture, considering that the surrounding community is Hindus, so that it is easily accepted by the community. The Gamelan Singo Mengkok is now stored in the Museum Sunan Drajat in Lamongan.
In Sumedang, West Java, there is an heirloom of the Kingdom of Sumedang Larang, there is a Gamelan Panglipur belonging to Prince Rangga Gede / Kusumahdinata IV (1625-1633) who is also the regent of Mataram. Gamelan was deliberately made to entertain himself after his beloved child died. The Panglipur gamelan along with 9 other ancient gamelan sets are kept at the Museum Prabu Geusan Ulun in Sumedang Regency. One of the ten sets of gamelan is the gamelan Sari Oneng Parakansalak from Sukabumi, West Java, which on 31 March 1889, participated in celebrating the inauguration of the Eiffel tower in Paris, France.


