Composed by Lalo Schifrin for the original Mission: Impossible television series in 1966, the theme became even more famous through the film series starring Tom Cruise from 1996 onwards. Its unusual 5/4 time signature and instantly recognisable opening notes helped it cross from television into film, advertising and internet culture. Today it is a shorthand for secrecy and daring plans online, appearing in countless memes, TikToks and YouTube edits whenever someone attempts something risky, sneaky or impressively over-the-top.