Why are folk songs the basis of traditional music?

Folk songs are the basis of traditional music, which is a conclusion based on the present situation of traditional music of 56 ethnic groups in China. Its foundation is mainly manifested in the following two aspects: First, folk songs account for the largest proportion, the widest distribution and the largest number of tracks and varieties in traditional music of all ethnic groups. The traditional music of some ethnic groups is almost all folk songs, such as She, Oroqen, Ewenki, Tu, Salar, Baoan, Yugur and Menba. Secondly, other music categories besides folk songs are also deeply influenced by folk songs in the process of evolution and development. For example, local song and dance music, tunes mostly come from local folk songs, and some even use a folk song or minor directly; Rap music in various places, some developed from folk songs, and some chose folk songs as singing tunes; In China's traditional opera music, not only many aria tunes originated from folk songs, but also some vocal operas developed directly from folk songs, such as Hunan Opera based on Hunan folk songs, Yue Opera based on Shengxian folk songs, Shigong Opera based on sacrificial songs "Shigong Tune" and Yi Opera based on Yi folk songs. In addition, folk instrumental music among ethnic groups also accounts for a large proportion, and most of the instrumental music owned by some ethnic groups is folk songs.