"Slow Slow Tune"from the Song Dynasty has 84 tunes,mostly with flat rhyme."Sheng Sheng Man"by Chao Buzhi continues the theme and vocal characteristics of Zhang Jie's"Sheng Sheng Ling"with dual tones and 66 characters,serving as a key point in the development from"Sheng Sheng Ling"to"Sheng Sheng Man".Zhang Ge was the first poet to use the tone name of"Slow Slow Tune"."Sheng Sheng Man"and"Slow Slow Tune"are homonyms.The tone of"Slow Slow Tune"follows the theme of lovesickness and separation of Hua Jian Ci of the late Tang Dynasty and the Five Dynasties.Its vocal expression,in-fluenced by the rhyme,themes,and styles of the poets,has evolved from the early tender and graceful style to a richer character encompassing sorrowful sobbing,joyfulness,elegant charm,solemn grandeur,and serene emptiness.