南笙离人凉北离歌
[nán shēng lí rén liáng bĕi lí gē]
With complex nuances, it weaves imagery of musical notes drifting apart between the warm south and cool north ('cool/lonely' is also part of person's name), indicating melancholy due to people and memories drifting far from each other. The overall sentiment leans towards separation and nostalgia.