I want to charge and listen to music at the same time.
Note: I have not tried this. It is simply offered as an example to show they are available.
https://www.amazon.com/Headphone-Charger-Charging-Earphones-...
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USB-C extension cables aren't allowed, but pass-through charging is allowed. I suspect a $7 cable from a Chinese amazon seller is not spec-compliant, but e.g. Belkin sells a spec-compliant "3.5mm Audio + USB-C Charge Adapter".
Nice. They don't work on Pixels if they don't have a DAC, because Google in its infinite wisdom decided not to include one on the Pixel series.
And cables like these violate the USB spec.
Again: what was the harm in including a 3.5mm jack?
I want to charge and listen to music at the same time.