Beijing Pingsi, Kuaisi and Mansi are different dances.
In terms of dance music, Beijing Pingsi is relatively free. You can use not only the music of Pingsi in Beijing, but also the music of Kuaisi. It doesn't matter how fast the pace is. However, not for nearly four. Fast-paced music can only be used in grade four, and slow-paced music is not suitable for grade four. Slow four is even more special. The music rhythm of slow four is much slower than that of flat four and fast four, and the dance music of slow four can only dance four times slower.
In terms of dance style, Pingsi is cheerful, smooth and beautiful; Fast four enthusiasm, publicity, more cheerful than flat four; Slow four is the slowest, but the gentlest, the most elegant and the most lyrical.
In terms of dance steps, Beijing Pingsi is relatively simple, with four steps within four beats and average strength; Thinking quickly is different. Although Quince also jumps four beats, and the last two steps are one step, it is not three steps. Slow fourth depends on the rhythm of dance music. Usually, the beginning and end of a pattern are slow steps (or sliding steps), which are slightly faster in the middle, but still slower than Pingsi and Pingsi.