Dave Bonta's "Refrain" is only a handful of words, but it holds a whole attitude toward dread. The speaker pictures "reckoning day," the moment of final judgment or accounting, and imagines it arriving in an ordinary, almost shabby form: "in a bottle." It could turn up "at the office / or at home," in the places where daily life is lived. The big apocalyptic idea shrinks to something you might pour out or find tucked away on a shelf.
Then comes the short last line: "I sing." It doesn't say what the song is, or whether it's brave, nervous, or defiant. That openness is what makes the ending interesting. The speaker doesn't argue with fate or beg for mercy. They simply carry on.
The mood is light on the surface, with a wry, shrugging calm, yet there's an edge underneath. The title suggests the singing repeats, like a chorus, as if singing is how the speaker gets through anything that comes.