O Fortuna opens Carl Orff's scenic cantata Carmina Burana, composed in 1935 and 1936 and premiered in Frankfurt in 1937. Orff set a medieval Latin poem about the wheel of fortune, and the chorus repeats at the beginning and end of the work. The excerpt became a shortcut for doom and grandeur in film trailers, adverts and television, then moved easily into online edits and memes. Its instantly recognised build means creators can signal fate, danger or mock serious drama in seconds without any explanation at all needed.