This is a Angklung, Angklung is a traditional musical instrument that developed in the community of Sunda, West Java. This instrument is a double pitched (multitonal) made of bamboo. How rang it rocked so that there is a clash between fellow bamboo to make a sound that vibrates in the order of 2,3 to 4 ringing tone in every large and small.
This is Indonesia which is filled with culture, and rich in objects such as traditional music instrument made of bamboo (Angklung).