"In my view national anthems are—politically read or societally understood— simultaneously apodictical and epideictic speeches. They are apodictical, unlike the meaning in classical rhetoric, not because conclusions are deduced from syllogisms of indisputable premises, but because social convention and the law protect their numinous quality. The apodictical, the indisputable, also refers to the concrete act of staging, in which objections to iconic and numinous qualities of the Gemeinschaft are not permitted. But national anthems are also epideictic in that they are supposed to persuade. They persuade in the concrete act of nation-building, and they celebrate the Gemeinschaft."
January 1, 1970
https://en.wikiquote.org/wiki/National_anthem