Etta James Lynard Skynard

Thanks to the subjective nature of music it's very difficult to label films about rock, pop or any other genres as 'universally enjoyable'. Indeed, gods in the eyes of one man (or woman) may not even be relevant to another, and with very few exceptions sitting down to watch two hours of footage - whether fact or fiction - dedicated to a particular sound comes with one pre-requisite; we must appreciate, if not ardently follow that style in order to bother sticking around for the duration of the movie.