Bunker rock is a genre of classical rock characterized by its apocalyptic themes. While its musical style can vary wildly, the genre is primarily identified by a sharp juxtaposition between style and thematic material. It is common to hear songs written in a major key while the lyrics reflect upon themes of death and destruction.
I sometimes feel like modern people are obsessed with the end of the world, but then I listen to some bunker rock and it reminds me that things have been this way for awhile.