Windows XP launched in 2001 as Microsoft's successor to Windows ME and Windows 2000, and its startup sound became one of the most recognizable computer noises ever made. Composed for the operating system's welcoming, optimistic design, the chime was heard daily in homes, schools and offices for over a decade. As XP aged, the sound turned into shorthand online for old technology, slow thinking and system errors, often paired with the famous error sound in memes and edits. Its simple melody remains instantly identifiable, even to people who never used XP themselves.