A type of modern Chinese poetry. The meter is strict. It originated from Shen Yue's new style poems in the Southern Dynasties that emphasized rhythm and parallelism during the Qi Yongming period. It was formally finalized during the Shen Quan period and the Song Zhiwen period in the early Tang Dynasty, and matured in the prosperous Tang Dynasty. Rhymed poetry requires the number of words in the verses to be uniform, with each poem consisting of five, six, or seven-character sentences, referred to as five-character, six-character, or seven-character verses, among which six-character verses are less common. The usual regulations for rhythmic poetry are 8 lines per song. If there are only 6 sentences, it is called a small rhyme or three-rhyme poem; if there are more than 8 sentences, that is, more than 10 sentences, it is called a long rhyme or long rhyme poem. Usually, a rhythmic poem is completed with 8 lines, and every 2 lines form a couplet, totaling four couplets. It is customary to call the first couplet the breaking title, the second couplet the jaw couplet, the third couplet the neck couplet, and the fourth couplet the conclusion. The upper and lower sentences of the second and third couplets (i.e. chin couplets and neck couplets) of each poem must be dual sentences. Except for the first and last couplets, the middle couplets must match the upper and lower sentences. The minor law has wider duality requirements. Rhymed poetry requires that the entire first rhyme rhyme, and only flat rhymes are allowed; the second, fourth, sixth, and eighth lines rhyme, the first line may or may not rhyme, and the words in each line of the rhythmic poetry alternate with straight and oblique tones. In the upper and lower sentences, there are two types of ping and qi relative to each other, namely "组qi" and "pingqi". In addition, the metrical requirements of verse also apply to quatrains.