Longtime Mac users will remember that the Mac used to “chime” when you powered it up. Apple removed the chime in 2016, but with macOS 10.15 Catalina, users could reinstate the chime through a command in the Terminal.
The chime is back by default in macOS 11 Big Sur. In the short video clip below, you can hear what the chime sounds like on my (beat-up) 2014 MacBook Pro running the Big Sur beta.
