The Godfather is the 1972 Francis Ford Coppola crime classic whose Nino Rota score, especially the famous waltz theme, became one of the most recognisable pieces of film music ever written. The melody escaped the cinema long ago and now lives online as shorthand for mobsters, power and old-world ceremony, turning up behind dramatic entrance music edits, parody don speeches and dramatic moment memes. Nearly fifty years on, a few trumpet notes still tell any audience exactly who is in charge.