One of my tinfoil conspiracy theories is that an unstated reason for the PMRC during the 1980s was not necessarily the "filthiness" of domestic music, but also that disco, never having died with the same finality in europe it that had domestically, had non-segregated audiences, and by the eurodance period, even featured integrated acts.

The Revolution (Prince) is an obvious counterexample, but they're post-Boomer (assuming 13 is the age for setting musical taste :-)

Charley Pride is a (the?) counterexample for Nashville.

Edit: a, not the. https://en.wikipedia.org/wiki/List_of_Country_Music_Hall_of_... (but DeFord Bailey was pre-Boomer)