Why did Fang Datong choose this name for the song Nanyin?

First of all, this song is based on the story of A Bing's two springs reflecting on the moon, which can be seen from the words "round sunglasses" and "two springs reflecting on the moon". Strictly speaking, it should be based on the erhu (although this instrument does not appear, it is obviously the bleak tone of the erhu that Datong hummed at the end of the song).

Er Quan was in Wuxi, Jiangsu, and A Bing used to play the piano by the spring. In addition, erhu was mainly popular in the middle and lower reaches of the Yangtze River in the early years. Therefore, to associate it with Quanzhou Nanyin and Quanzhou Xianguan in Fujian, the most important thing is to take its string as ancient and elegant, and the singer is crying (as netizens said), which sounds artistic, but not real, otherwise the lyricist lin xi will make a common sense mistake.

There is another explanation, that is, lin xi didn't associate it with Fujian ancient music at all, but the word came to mind and used it. However, this is unlikely, because Nanyin, a rap music, originated in Fujian and used to be quite popular in Hong Kong and the Pearl River Delta, but it has gradually died out in recent years. From this point of view, it is possible that lin xi felt the decline of this ancient opera, and out of nostalgia, he linked it with the bleak past of A Bing in the Republic of China to express a kind of mourning. Blind musicians, regardless of whether they are red or not, are persistent all their lives, which is even more touching under the background that the ancient sound is gradually forgotten.