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When you begin to think of Pop music as a product rather than a genre, the rocktivist argument makes a lot more sense. Art critics could write reviews of the output of graphic design firms, but usually they leave that task to Ad Week.
This piece does nothing to answer the question, “What is pop music?” but it does introduce a new word into the lexicon: “rocktivist”!
RockCritics.com 
Unlike graphic design and art, there aren’t remarkably different conventions, conversations, and standards for pop and rock music. Pop is far more ambiguous a descriptor than “product,” certainly, and probably more ambiguous than “genre,” too.