How to explain the lingering sound?

Echoes, Chinese idioms and pinyin, describe the beauty and echoes of singing or music. It is also a metaphor that poetry is meaningful and intriguing. From Liezi Tang Wen.

Han E was a Korean folk singer in the Spring and Autumn Period. She is not only beautiful in appearance and beautiful in voice, but also her singing is full of emotion and strong in appeal, which makes everyone who has heard her sing deeply intoxicated.

Nevertheless, Han E still lives in poverty. She lived in an inn, and the owner sneered at her. Han E, full of grief, took to the streets to sing and express his grievances. Her singing is infinitely sad. After listening to it, people are immersed in sad emotions all day. Finally, they had to invite her out to sing a happy song, and people were freed from their sadness with her cheerful singing. Thus, Han E's singing is of extraordinary artistic appeal.

Liezi records that on one occasion, Han E traveled eastward from South Korea to Linzi, the capital of Qi State. At that time, Linzi City had a prosperous economy and a very active cultural life. "Everyone plays the trumpet, drums, architecture and piano." At that time, there were many people who knew music here. Han E ran out of dry food and sang for food in the capital Yong Men. Her beautiful and moving singing, mellow and euphemistic, beautiful expression and deep sorrow deeply touched the hearts of the audience and attracted a large number of listeners. People gathered around her and listened with rapt attention. Those who work stop, those who walk stop, those who quarrel stop, those who cry lose their voices, and those who open stores close. After Han E sang, people donated money to support her. Han E was full and left with the money for singing. Three days later, people felt that Han E's beautiful singing still lingered among the beams, as if he had not left. Later generations called it "lingering sound", and Han E created an idiom with her beautiful singing voice, which was handed down from generation to generation. Later, people in Linzi often practiced Han E's songs. As time goes on, people here like singing more and more.