He didn’t steal it, he acknowledged black performers of the time as being better than him. I think he would have made that same music if he was born black, brown whatever he just had the advantage at the time of being white which got him his audience. Having a large audience because the majority of the country can identify with you easier doesn’t make you a thief(ironic you mention Em another guy surrounded by blacks and African Americans and championing them) people choose who they listen to, can’t force it. That said this movie looks interesting, I liked a lot of Elvis’ music.