Windows XP was released by Microsoft in 2001, and its shutdown sound played whenever users closed down the operating system, becoming one of the most recognisable audio cues of early 2000s home computing. As those computers were replaced, the short melody survived online through nostalgia videos, retro technology channels and meme edits that used it to signal an ending. It remains popular because it is instantly familiar to a generation that grew up with dial-up, chunky monitors and shared family PCs, and because its calm tone makes a clean, funny closing beat.