Recently, I’ve been thinking about sounds that have been lost. You know, things that were once commonly heard and are now either completely lost, literally unheard of, or at least endangered.
For example, the sound of a flock of passenger pigeons. They used to flock in their millions or even hundreds of millions and that must have made a unique and characteristic sound. Now no one living has ever heard that sound. Someone may have heard something like it but not that precise sound.
A record skipping.
In technology there are all sorts of examples of lost or endangered sounds. The sound of a manual typewriter, operated by a skilled practitioner. An acoustical modem raising carrier detect. A busy signal.
Another example: I have a copy of a phonograph record of my mom and dad singing a duet. Now it’s so worn as to be inaudible. It’s lost.