The idiochord tube-zither
•The idiochord tube-zither is a bamboo internode with strings raised up from the epidermis (hence the term idiochord) between two internodes. Small wooden bridges are inserted under the strings both to lift them from the surface of the bamboo and to tune them. All these are relatively recent and the basic type is still widely played in the Philippines and Indonesia.
•The broad distribution of the tube-zither is Philippines, Indonesia, Madagascar, Việt Nam. The Aslian groups of the Malay peninsula also play the zither, although not the surrounding Malay. Its presence in Madagascar is presumably due to the migrations of the Maanyan, one of the Barito groups now thought to have been the main source of the peopling of the Great Isle. Tube-zithers are entirely absent in Melanesia and Polynesia, and  Oceanic speakers had already lost his instrument when they began their expansion.