To put it simply, it means applying the rhythm of ancient poetry to write new things

It can also be understood as integrating traditional things with modern elements to reflect modern or advanced ideas. For example, some of Jay Chou's musical works "Dongfeng Po Blue and White Porcelain" can be understood as ancient rhyme and new style

Really speaking, ancient rhyme is a more professional academic scope

The ancient rhyme Chinese phonology terminology, with For the rhymes of Chinese pre-Qin and Han Dynasty verses based on the Book of Songs, please refer to Baidu Encyclopedia - Ancient Rhymes

The ancient rhymes are based on the four ancient tones, and the new rhymes are based on the four modern tones.

The ancient four tones include the flat tone, the upper (three tones of "shang") tone, the falling tone and the entering tone. The current four tones are Yinping, Yangping, the upper (four tones of "shang") tone and the falling tone. There are many ancient rhyme books, the more famous ones include "Ji Yun", "Guang Yun", etc.

Poets generally respect plain water rhyme when writing poems and lyrics. Nowadays, poems can be written in either ancient rhyme or new rhyme. However, it is generally stipulated that anyone who uses new rhyme should indicate the word "new rhyme" in front of it to avoid confusion