Yes in the USA there are laws that require CC on programs being televised, but not all. Interestingly enough, one of the TV exemptions is programs that are mostly musical.
After doing a bit of research now I can see your point and I agree with you that this could set up a legal situation like it did back in the 90s. I wouldn’t mind if they revisited the 1996 Telecommunications Act so they could break up the radio monopoly here, but I digress.