Complexity and variability, asymmetry and asymmetry.

1. According to the QQ Music official website, complexity and variability: 20th century music broke the traditional concept of beat and rhythm, adopting complex rhythm and beat structure, irregular rhythm, polyrhythm , no rhythm, etc., making the music more varied and dynamic.

2. Asymmetry and asymmetry: The traditional beat structure is symmetrical and has certain regularity, while modern music uses asymmetric beats and asymmetric structures, making the music more free. and flexible.