Seven-character quatrains originated from ancient Yuefu, while seven-character quatrains are an independent poetic style after their appearance, and their origins are different. There are Long song, short songs, Yan songs, Qige, Yan songs, plaintive songs, lamentation songs, bow songs and songs in Yuefu in Han and Wei Dynasties, which can be regarded as the ancestors of Yuefu in Tang Dynasty. Among them, Qiyan Song is the natural development of Qiyan Yuefu since Han and Wei Dynasties. In Qing Dynasty, Wu Qiao's "Poems around the Furnace Taste the Clouds": "Seven words were created in Han Dynasty, Wei Wendi had Yan Ge Xing, and the ancient poem Dong Fei Bo Lao flourished at the end of Liang Dynasty. There were also people who used five or seven words miscellaneous, and they were the founders of the Tang Dynasty." The so-called ancient poem "Flying East Shrike" is the "Flying East Shrike Song" recorded in Yuefu poetry anthology and miscellaneous songs. Therefore, the seven-character rhyme originated from Yuefu in the Han, Wei and Southern Dynasties. As for the seven-character ancient poems, it is said that they originated from Bailiangtai poems during the reign of Emperor Wu of the Han Dynasty. However, there are as many as 24 authors of Bailiangtai Poetry, each of whom has one sentence, which can only be regarded as a joint sentence, not a complete seven ancient poems. Therefore, from the perspective of poetic style, the two have different sources.
Secondly, as far as the main characteristics of the style are concerned, the requirement of the seven ancient poems is to draw a clear line with the seven-character poems (including the seven laws and seven laws). There is a saying in Wang Shizhen's The Balance of Ancient Poetry in Qing Dynasty: "Seven words are indifferent. If the rhyme is flat, it must not be mixed. " In seven-character ancient poems, there are three sounds at the end of the sentence, and the sentence emphasizes loneliness and dullness, which are all reactions to metrical poems. As for the Seven-character Song, although some early works are quite similar to the ancient Seven Dynasties in style and style, the phenomenon of legalization has become more and more serious in its evolution. According to Wang Li's China Poetics, there are 53 metrical and quasi-metrical sentences in Bai Juyi's 88 sentences of Pipa Xing, and the song of everlasting regret 120 accounts for as many as 100 sentences. The formation of this legalization trend is not accidental, it is the result of pursuing harmony of sound and rhyme due to the requirements of singing poetry.
Thirdly, from the literary style, the typical style of the ancient seven dynasties is correct, vigorous, solemn and elegant, while the typical style of singing is elegant and gorgeous. The preface to the analysis of the style of the article holds that "seven-character ancient poetry lies in bold sentences and ancient customs", and the style of "lyric for a long time" is different from that of "running script" "Seven Ancient Poems" also said: "Ancient poems are embarrassed by style, and their system lies in melody, but their lines are short and long, and they are intricate and unsystematic, so they can make people think deeply. Li and Du Zhicai are not only in ancient poems, but also in songs. " In addition to the seven ancient and seven laws, the seven-character songs are regarded as one because of their different styles. Zhao Wei Zhan Yan said that "seven words are wonderful, simple, clumsy, trivial, curved, hard and light, and they are indispensable." Always say "old" and "whenever you sing, be honest and don't ask the police." Man "means that love words are swaying and flowing;" Police "means dignified justice and sophisticated language." These comments all reveal the differences in aesthetic styles between seven-character ancient poems and seven-character songs. Although it was once popular to write poems with seven ancient styles and poems with seven ancient styles in specific poetry creation, it is not difficult to see the difference between them on the whole. For example, Du Fu's Notes on Examining Korea, Lu Tong's Poem on Eclipse, Han Yu's Poem on Hengshan Temple Don't Me, and Li Shangyin's Han Bei can only be a seven-character ancient poem; However, Wang Wei's Peach Blossom Star, Li Bai's Climbing in the Dream of Tianmu Mountain, Bai Juyi's Song of Eternal Sorrow and Wei Zhuang's Ode to Fu Qin can only be seven-character poems. The difference between the two is obvious.