<P> Kroncong is a musical genre that uses guitars and ukulele as the main musical instruments . This genre had its roots in Portugal and was introduced by Portuguese traders in the 15th century . There is a traditional Keroncong Tugu music group in North Jakarta and other traditional Keroncong music groups in Maluku, with strong Portuguese influences . This music genre was popular in the first half of the 20th century; a contemporary form of Kroncong is called Pop Kroncong . </P> <P> Angklung musical orchestra, native of West Java, received international recognition as UNESCO has listed the traditional West Java musical instrument made from bamboo in the list of intangible cultural heritage . </P> <P> The soft Sasando music from the province of East Nusa Tenggara in West Timor is completely different . Sasando uses an instrument made from a split leaf of the Lontar palm (Borassus flabellifer), which bears some resemblance to a harp . </P> <P> Indonesian dance reflects the diversity of culture from ethnic groups that composed the nation of Indonesia . Austronesian roots and Melanesian tribal dance forms are visible, and influences ranging from neighbouring Asian countries; such as India, China, and Middle East to European western styles through colonisation . Each ethnic group has their own distinct dances; makes total dances in Indonesia are more than 3000 Indonesian original dances . However, the dances of Indonesia can be divided into three eras; the Prehistoric Era, the Hindu / Buddhist Era and the Era of Islam, and into two genres; court dance and folk dance . </P>

What is the culture and tradition of indonesia