How did the allusion "fishing sings late" come from?

"Fishing Boat Singing Late" is a Zheng Song with classical style. The music depicts the beautiful scene of the sunset reflecting the blue waves, fishermen enjoying themselves and fishing boats drifting with the tide. This piece of music is the most widely circulated and influential Zheng solo in China since 1930s. It comes from the phrase "fishing boat sings late, Li Peng is poor" in Wang Bo's Preface to Wang Tengting in the Tang Dynasty. The music depicts a moving picture of fishermen singing and returning home in the afterglow of the sunset. At the beginning of the music, with beautiful and elegant tunes and soothing rhythm, a picture of the sunset reflecting the blue waves is painted. Then take the theme of music as the material, and the music is lively and interesting. When it changes again and again, it falls around a beautiful melody layer by layer with a five-tone detour. This melody is not only very stylish, but also beautiful, and it is really interesting to sing late. Finally, the melody that rises first and then falls is combined into a circular circle, which is repeated many times, and the speed is accelerated one after another, showing the happy fishermen carefree, pieces of white sails drifting with the tide, and the fishing boat returning with full load. The poetic Zheng music of the richest man has been adapted into, guzheng duet and violin solo.