It can be understood as: thinking about the north and writing love poems; Miss the south and sing love songs. It can also be understood as: love poems in the north and love songs in the south. Or understood as: thoughts and love poems in the north; Gu nian and southern love songs. This sentence has the following explanation.
1, broken sentence: reading north, poetry; Gu and nan and song dynasties. If this sentence is broken, then the "harmony" in it has no real meaning and cannot be translated; "Poetry" and "song" are both verbs, which mean "writing poetry" and "singing" respectively. The whole sentence means: miss the northerners and write love poems to express their thoughts; People who care about the south sing love songs to show their concern. It means that a pair of lovers are far apart and miss each other.
2. Sentence breaking: reading harmony, northern poetry; Grain Rain, Nan Ge. In this way, "harmony" has no real meaning, while "northern poetry" refers to northern poetry; "Nanqu" refers to southern songs. Poetry in the north and songs in the south can be used to refer to people in the north and people in the south. The whole sentence means: love poems that miss northern lovers; Miss the love songs of southern lovers. It also means that a pair of lovers in the north and south miss each other.
3. Sentence breaking: reading and northern poetry; Gu Yu nan ge. "Harmony" is interpreted as "harmony", and the whole sentence is translated as: thoughts and love poems in the north; Gu nian and southern love songs. Putting "Nian" and "Northern Poetry" together and "Gu" and "Southern Song" together means putting "Nian" on "Northern Poetry" and "Gu" on "Southern Song". That is, northerners pin their thoughts on love poems; Southerners pin their minds on love songs. Either way, the general idea is similar, which means that although a pair of lovers live far apart, they both miss each other very much.