What are the four characters in traditional Chinese opera performances?

Full of emotion and affection, the Hui class went to Beijing, and four Hui classes were unstoppable, singing and playing. The first three Ding Jia, the last three Ding Jia, four famous Dan, four famous Dan, all sang and danced (this is a summary of the famous Peking Opera theorist Qi Rushan's performance art of Peking Opera), and they were ugly (it is wrong to say on the first floor that they are born and sick,

In addition, there are many four-character names in business names, such as singing old pedant and putting on airs. And there are many more four-word titles, such as the drunken imperial concubine and Xu Ce running all over the city. Generally speaking, these are all four words about traditional Chinese opera, but they don't seem to be what you want, but the word "going to Liangshan" in the title of the play is definitely what you want, right?