Bach's Chakhon, which is the fifth of Bach's Piano Suite No.2 without accompaniment. With its large scale and unique writing technique, this piece is one of Bach's most famous works, and is called a masterpiece among masterpieces. The unique charm of this piece of music makes almost all violinists fall for it. The music is soothing and soft, full of memories, and inadvertently reveals a little sadness, which makes people have to indulge in it.

Schweitzer, a Nobel Prize winner and Bach expert in 1952, once said, "Bach calls out a world with a simple theme!"

Fukuda Shinichi, a guitarist, said, "Qikong is like a person's life. It starts with crying, and then life is bumpy, drama changes, joy, joy and victory-aging and sadness after the tune change ..."

regarding the content of the music "Cha Kong", the German music historian Spita once described it as follows: "The torrent of music comes from an imperceptible source, which shows that the author has the deepest understanding of violin skills and has the absolute ability to dominate the grand imagination, which is unmatched by any artist. From the serious and grand beginning, we passed through the painful and uneasy second theme, and transitioned to a series of ghostly 32-minute notes galloping up and down, which shrouded the third theme insidiously. The trembling arpeggios moved slowly, like a cloud curtain hanging over the gloomy valley. Suddenly, a gust of wind came, which made it into a huge ball and slammed it into the forest. Trees groan and shake, and leaves fly everywhere. So we enter the beautiful and solemn D major. The evening sun shines on the valley, the golden brilliance ripples in the atmosphere, the stream turns into flowing gold, reflecting the dome, and the solemn glow goes straight into the sky. The spirit of this master inspires us to use musical instruments to express incredible scenes. By the end of this passage in D major, music has become like an organ, and sometimes we seem to hear many violins singing together. The third part, starting from variation 25, returns to D minor, which is like a condensed reproduction of the main paragraph. Finally, the prototype of the theme is completely reproduced and ends in a solemn atmosphere. "