Contrary to rational and mathematical sequence music and speculative statistics, in the 1950s, accidental music represented by American composer J. Cage and German composer K. Stockhauer emerged. Uncertain music represented by Sen. Unlike other modern music, accidental music is not a technique, but a manifestation of ideas and musical views, derived from the Chinese Book of Changes and Buddhist Zen, especially the mysticism in it. In this kind of music, Cage even regarded silence as music. In the past, there were many composers who regarded rest in music as silent sound. However, it is unprecedented for Cage to equate silent sound with sound, and even regard it as more important than sound.