Apple's Mac startup chime has been part of the Mac experience since the early Macintosh era, but the version heard here is the modern chime associated with macOS Big Sur, released in 2020, and carried through later releases such as Monterey, Ventura and Sonoma. After a period when newer Macs started silently, Big Sur made the familiar tone available again on startup. It spread online through unboxing videos, setup tours and tech memes, and it remains popular because it instantly signals an Apple computer powering on.