Windows XP was released by Microsoft in 2001 and became one of the most widely used PC operating systems of the 2000s, so its interface sounds were heard daily by millions. The shutdown chime was the counterpart to the startup sound, marking the end of a session. As XP faded from everyday use, recordings of its sounds spread through YouTube compilations, nostalgia posts and meme edits. It remains popular because the melody is instantly recognisable, short enough to drop into any edit, and strongly tied to early internet culture.