If you’re looking for 30 minutes of amusement but have two hours to spend, Walk Hard: The Dewey Cox Story may be just the movie for you. I’d give it the arguably-generous rating of 6/10 only because when Walk Hard is on, it can be brilliant. An early Sun Records parody sticks out in particular, but it’s a high bar the movie only reaches a few more times over its, uh, 120 minutes.