The startup sound was introduced with Windows Vista in 2007 and was created with guitarist Robert Fripp under the direction of Microsoft's sound team. Windows 7, released in 2009, kept the same chime, which is why the two systems are grouped together online. Composed of layered synthesized tones meant to evoke the Vista aurora branding, it replaced the longer Windows XP startup melody. Millions heard it daily for years, and it later spread through YouTube nostalgia compilations, meme edits and soundboards as a symbol of that PC era.