The beach boys did rip off Chuck Berries song "Sweet Little 16." He latter sues them and wins. So that did actually happen and the rolling stones named their band after a Muddy Walter song. Look it up. And the movie never pretends to be a documentary it is a fictional story based on true events. Audiences that are too lazy to look up the truth, well shame on them. Though Etta James and Chess never had an affair that does not take away from the fact that he was a notorious womanizer. If anyone's character is hurt by this piece of fiction its Etta James.