The sound comes from Windows XP, the Microsoft operating system released in 2001 that became one of the most widely used versions of Windows. Its startup chime was designed to feel welcoming and futuristic for home users moving from older systems. As XP stayed on school, office and family computers for over a decade, the melody became deeply familiar. Clips of old PCs booting up later spread on YouTube and meme pages, often paired with the Windows error sound for comic contrast, keeping the chime alive as retro shorthand.