I Am Become Death (Auntie Beeb version) by Wretched Saints

Audio clips from "The War Game" (1965), "Threads" (1984; has been called "the most terrifying movie of all time") and "Nuclear Attack Emergency Broadcast" (a 55-minute Youtube clip by an unknown uploader which has since been removed).

Song made entirely with Qtractor on Linux and various other open source software.