Another good (and fun) print reference is HOLLYWOOD ROCK by Marshall Crenshaw. Crenshaw, himself a musician, reviews almost everything that could remotely be called a r'n'r film. Lots of stuff you never heard of. He gives each film three ratings (up to five stars)--for "music," "attitude," and "fun." What doesn't actually get reviewed is at least described in some detail in the appendixes.
I got this as a cut-out three or four years ago ($3.99). It's OP apparently, but Amazon is auctioning off a couple of copies.
Greg Callahan