Ludwig van Beethoven composed his Symphony No. 5 in C minor between 1804 and 1808, and it premiered in Vienna in December 1808. Its opening four-note motif became one of the most famous phrases in classical music, often described as fate knocking at the door. The rhythm has since appeared in films, television, advertisements and cartoons, and online creators adopted it as a quick signal for drama or impending disaster. Because the pattern is so short and instantly recognisable, it still works perfectly as a meme sound decades after its first popular uses.