Windows Whistler was the codename for Windows XP, which launched in 2001 with Brian Eno's famous startup theme. This clip is fanon, a fanmade imagining of what a Whistler-specific boot sound could have been, created and shared on soundboard communities by retro computing fans. Sounds like this circulate in videos about alternate computing history and lost Microsoft eras, and they stay popular because the XP boot chime is one of the most recognisable sounds in personal computing.