Why does Vonnegut start some of his chapters with "listen"?
In this Slaughterhouse Five , Vonnegut uses certain conversational elements to establish a narrative voice that is diffident, intimate, honest, baffled and humble.
Opening some chapters (chapter 2 and chapter 6) with the phrase Listen is just one of the ways that Vonnegut creates the narrative voice of the novel.
Another way the voice is formally complicated is the presence of a narrator - the writer - and a protagonist through whom we experience the bulk of the story. This essentially means that the narrator is a character telling us a story, which reinforces the conversational qualities of the narrative voice.