Why is vocal music of Mindanao important to the islamic community specially to the ethno-linguistic groups?

A. music of Mindanao is important because it is related to different occasion

B. music of Mindanao is important because it was written by the folk and sung to accompany daily activities

C. it is important because similarities do exist in their vocal styles that make up the larger Islamic society belongs to one single tradition

D. it is important because many of the ethno-linguistic groups in Mindanao are good in singing and playing traditional instrument​