Yangchunbaixue: originally refers to the Warring States period, the state of Chu, a higher level of song, mainly for the court singing, the common people rare. So it is used as a metaphor for high and profound not popular literature and art. Now also be extended to some elegant things.

Downer's Song: The same is a song of Chu, but it is mainly popular among the people. Therefore, it is used as a metaphor for popular literature and art. Now it is also derived as something popular and popularized.

Expanded:

The allusion to "white snow in the spring of the Yang Chun" comes from the article "Song Yu's Answer to the Question of the King of Chu" in the Chu Ci (楚辞). .

King Xiang of Chu asked Song Yu: What hidden virtues do you have? Why don't the scholarly public praise you much?

Song Yu said, "A singer was visiting Ying in Chu, and at first he sang "The People of the Lower Mainland", which was echoed by thousands of people in the country. When the singer sang "Allium cepa", the country and only a few hundred people. When the singer sang "White Snow in Yangchun", there were only a few dozen people in the country. The conclusion is that "the songs are higher, but the harmonies are fewer". Yangchunbaixue and other songs, the more elegant, the more complex, can sing and naturally fewer and fewer people, that is, high and low.