Back in Black was released by AC/DC in 1980 as the title track of their seventh studio album, the band's first record with singer Brian Johnson. Its opening guitar riff became one of the most recognisable intros in hard rock and a staple of films, adverts and sports broadcasts. Online, the short riff spread through edits, memes and highlight videos, where its instant familiarity gives even a brief clip a sense of power and swagger. That staying power keeps it popular for entrances, reveals and comebacks decades after its release.