What are the characteristics of Liu Yong's ci? What contribution did he make to the development of Song poetry?

Liu Yong began to create a large number of long tunes, and most of his works were slow words with long tunes and techniques, which made the Northern Song Dynasty ci change from Xiaoling period to slow ci period. Liu Yong is good at melody, and most of his lyrics are his own. His works are harmonious in melody, appropriate in meaning and suitable for singing.

The style of Liu Ci is graceful, subtle, lingering, profound, sincere, beautiful and harmonious. Liu Ci is good at describing, describing, sketching and using spoken English. The language is popular and simple, and dialects and proverbs are widely used.

On the subject matter, Liu Yong developed and expanded the content of ci, described the urban scenery, touched a broader side of urban life, expressed sympathy for the unfortunate vagrant women, and indulged in the psychology and feelings of men and women in the bustling life of the city; Liu Yong also wrote about melancholy, feelings of parting, beautiful mountains and rivers, and lamenting the past. At that time, people said that the peaceful scene of Song Renzong in 42 years was written into Liu Yong's works.