Microsoft introduced this chime with Windows XP, released in 2001, where it played each time a user signed in to the operating system. For a generation who grew up with family PCs, school computers and early home internet, it became the everyday sound of starting a computer. Long after XP was retired, clips of the logon sound spread through YouTube compilations, nostalgia edits and meme videos, where it instantly signals the early 2000s. Its short, optimistic melody keeps it recognisable even to viewers who never used the system themselves.