https://screenrant.com/back-to-the-future-chuck-berry-paradox-answer/
Marty McFly performs "Johnny B. Goode" in a pivotal scene, and there is an explanation of how this isn't precisely a bootstrap paradox.
It never was a bootstrap paradox
Bootstrap only applies when the time-traveler causes the present to occur exactly as it already exists.
Bootstrap only applies to the unchangeable timeline model of time travel fiction. The BTTF franchise follows the "many worlds" model of time travel fiction.
That became evident when "Twin Pine Mall" changed to "Lone Pine Mall" along with the radical changes to Marty's family.
For example, it WOULD have been a bootstrap paradox if Doc Brown "invented" the flux capacitor only after seeing the real thing in the Delorean. Instead, the film made it point to show how Doc's initial drawing existed before he looked into the Delorean.
So, at the end of the film, Chuck Berry MAY have been inspired by Marty, but Marty himself was inspired by a version of Chuck Berry from the previous timeline who never got that call from his cousin Marvin.
Yes, exactly this. There's no reason that Chuck Berry couldn't have still developed the distinctive sound of Johnny Be Good without the inspiration from his cousin Marvin's call.
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