This is from the Iron and Wine song "Innocent bones". As a non-native English speaker, I'm struggling to understand the exact meaning. It is thoroughly a grammatical question.
- How every mouth sings of what it's without so we all sing of love
- Does it mean that, because everyone is singing about things they lack, "we" simply sing about love, and lack nothing? or
- Does it mean that everyone is singing about things they lack and "we" too sing about a thing we lack - love?
I think I do not understand the meaning of "so" in this sentence.