Macintosh computers have played a startup sound on boot for decades, signalling that the machine has passed its initial checks and is ready to use. Over time the chime became one of the most recognisable device sounds, associated with Apple desktops and laptops in homes, offices and films. This iPhone version adapts that familiar chord for phones, where fans share it as a ringtone and notification tone. Its lasting appeal comes from instant recognition and nostalgia, turning a simple power on moment into a small, satisfying event.