I also don't like the categories. Rock is too broad and ambiguous. There is a rock lifestyle, there is a rock industry, there is an original more specified genre (maybe, even that is very blurry), and there is the current umbrella of popular music which is often called rock or pop/rock, but which bears little or no necessary resemblance to either the early musical form, or even to the culture or ideals of the original music. Certainly, one would also need to differentiate between rock being bad on an artistic/musical level, and on a moral level in relation to its message.
For the record, I think there is a large body of works that fit into the broader category of "rock" which are worth while both musically and intellectually, and even
some of those works which contain objectionable material may have valuable lessons to teach the discerning Christian about the lost and the culture at large. I happen to own over 300 CDs worth of them
