I don't see why good songwriting can't include concise catchy songs as well as longer more 'rock' orientated stuff. Pop songs tend to have the catchiness even more in the vocal line perhaps, that's where the expression tends to be more as well. So catchy songs can definitely have expression to me. And catchiness in general I think is prevalent throughout people's enjoyment of all kinds of music anyway, if the musical material isn't memorable then normally people don't like it much. In more 'rock' stuff the catchiness may be more drawn out or more fleeting than in many pop songs but it can still be there. The craft of songwriting surely includes any ability to invent within a particular structure whether that be rock or pop.
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