simple electronic music box circuit

I recently found a cool circuit that uses a couple of classic old-school chips in a very interesting way.

Let's put it together and we can figure out how it works.

Here's the circuit in question:
https://www.homemade-circuits.com/sim...

And here's the Forest Mims 555 timer book:
https://archive.org/details/electroni...


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This isn't the only way to do it.
It's probably not the best way to do it.
But it's how I did it.