A brief explanation about it:
Kolintang is a typical musical instrument of the Minahasa (North Sulawesi), the base material is wood that if hit could emits a fairly long sound and can reach high or low notes. The examples of the wood that being used are: kayu telur, bandaran, wenang, kakinik. (kind of timber rather mild but quite dense and the wood fibers arranged in such a way as to form parallel lines).
In my school, the music lesson is for the tenth grade. When I was in the 10th grade, each class divided into teams to play traditional songs. It was fun and nice for me since I can also learn again to play the kolintang, besides, I can also learn more about Indonesian culture.