The word "canon" originally meant canon, religious regulations, rules or classics. Musically, it refers to a writing technique of polyphonic music: each part imitates each other regularly, that is, the following parts imitate the melody of the previous part in turn at a certain time interval. The music written by artillery is called "cannon song" The Rondo we often hear is one of the cannon songs. Canon is by far the most popular classical music in the world. After being adapted into modern music, it dominated the American billboard pop music charts for more than one hundred weeks. According to Guinness World Records, more than 2,000 versions of Canon have been re-interpreted and published in the world so far! Canon is actually only a musical sketch with a total length of only about 5 minutes, but it has brought a miracle for 327 years, and it will last forever. The original version of "The Cannon" can't be heard today, but the beautiful movement of "The Cannon" has been constantly interpreted by later famous artists and introduced from time to time.