What you are talking about should be Du Fu's Climbing to the Top and Looking Far, Apes Crying in the Sky, Ode to Monuments III, and Thousands of Rivers Can't Fill Jingmen.
Among them, Ascending the Height is a masterpiece in the Seven Laws, because the whole article is antagonistic. Lao Du is best at seven-character poems, while Li Bai is best at classical poems. They have different styles.
China's ancient poetry can be roughly divided into two categories: one is called archaic poetry (or "ancient style"), which began in the Tang Dynasty. In the Tang Dynasty, the new metrical poems at that time were called modern poems, while the poems with less metrical restrictions before the Tang Dynasty were called ancient poems. According to the Tang Dynasty, later generations called Yuefu folk songs, poems written by scholars before the Tang Dynasty and poems written by scholars after the Tang Dynasty "archaic poems". According to the number of words in poems, there are four words (such as The Book of Songs), five words (such as Han Yuefu's poems), seven words (such as Ge Yanxing by Cao Pi) and miscellaneous words (such as Li Bai's Difficult Road to Shu). Classical poetry rhymes freely. The other is called modern poetry (or "modern poetry"), which is a new style of poetry that appeared in the Tang Dynasty.
There are two kinds of modern poems, "quatrains" and "metrical poems". The latter has eight sentences each, five words are abbreviated as five laws, seven words are abbreviated as seven laws, and more than eight sentences are called excluded laws (or "long laws"). The rhythm is very strict. There are definite sentences (except arrangement), definite characters in sentences, definite rhymes (definite rhymes), definite tones (definite tones of each word in the poem) and definite couplets (the two rhymes in the middle must be aligned).