A chord turned startup into a clear signal
When a computer takes time to start, the user cannot easily tell whether it is working or stuck. A sound can answer that question before the screen does. The Mac’s startup chord was meant to mark successful booting: one brief, recognizable cue that the machine had reached a usable state.
That made the sound more than decoration. It gave an otherwise invisible process a simple ending, reducing the uncertainty of waiting. The chord’s role was reassuring precisely because it meant something specific: startup had succeeded.
Why a chord felt different from a beep
Early computer sounds often served as warnings. A sharp error beep called attention to a problem; heard during startup, that kind of noise could make an ordinary pause feel like a failure. Jim Reekes chose a C-major chord instead. A chord is several notes heard together, and this one offered a fuller, more settled impression than a solitary alert tone.
That does not mean C major is automatically calming to every listener. The design depended on the sound’s contrast with error signals and on what users learned it meant. Once the chord became associated with a successful start, hearing it could reassure people before they had checked anything else.
Sound as part of the interface
The choice illustrates a small but important design principle: computers communicate through more than words and images. A brief sound can make a hidden transition legible, helping users distinguish “still starting” from “ready.” In this case, the reassuring cue was also functional—it told people the wait had ended.
