a minimalist style reminiscent of the large gongs in a gamelan. On top of this rhythmic layer, the melody and elaborate ornamentation is carried by a voice, flute, or violin. The violin or flute are used to play introductory passages that are often elaborate. The fills and scalar runs are both faster and more elaborate than the guitar's. The vocalist sings the melody which is slow with sustained notes in traditional Kroncong. The repertoire largely uses the Western major key with some arrangements in the minor. One departure from this occurs when Kroncong orchestras play Javanese songs (Langgam Jawa). Javanese music ordinarily uses scales and intervals that do not occur in Western music. Kroncong Jawa maintains Western intervals but adopts a 5-tone scale that approximates one of the main Javanese septatonic scales. When playing this style, cak and cuk leave their characteristic interplay and both play arpeggios to approximate the sound and style of the Javanese instrument the siter, a kind of zither. The cello adopts a different rhythmic style as well. History Kroncong music began in the 16th century when sailors from the Portuguese Empire brought Portuguese instruments and music to Indonesia. Lower-class citizens and gangs, commonly called buaya (a reference to buaya darat, a term for playboys literally meaning "crocodile on land") adopted the new musical styles. Eventually, they were assimilated by the upper-class citizens. Paul Fisher writes, The small kroncong guitar, also the name of a music, is derived from the Portuguese braguinha, sharing its roots with the Hawaiian ukulele. Kroncong music is believed to have originated in the communities of freed Portuguese slaves called Mardijkers in the 16th century. European influence from this time can also be heard in the music of the Batak people of North Sumatra. From the end of the 19th century, the beginnings of guitar accompaniment incorporated within a distinctly Indonesian idiom in music came from Sumatra, South Sulawesi and elsewhere. Kroncong (currently spelled Keroncong in Indonesian) is now considered as old-fashioned folk music by most Indonesian youth, although efforts have been made since the 1960s to modernize the genre by adding electric guitars, keyboards and drums, notably in the so-called Pop Keroncong sung by Hetty Koes Endang. The melancholic spirit of traditional acoustic Kroncong (similar to Portuguese Fado music) has been recorded by Krontjong Poesaka Moresco Toegoe Jakarta-based in Tugu, who have performed at the well-known Indo festival 'Pasar Malam Besar'