I ordered a cheap pair of noise-cancelling Bluetooth headphones from Amazon:
https://www.amazon.com/gp/product/B07YFW5DG6
I'm hoping they do well for phone calls and watching videos, mostly, but it would be great if they're good enough for music, too. And also, I'm very curious as to whether wearing them purely to reduce ambient noise will have any noticeable effect on my state of mind, given the profound effect I now notice when putting on my very dark (Cat. 4) sunglasses, here in the land of the High Desert Sun.
The reviews on the headphones I bought are good. I'll make note of what I think of them here, when they arrive.
I bought a "Used-Very Good" pair from Amazon, for $54.73US.
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Darron, temporary "Rat of NIMH"