For better or worse, popular music depends upon the existence of casual fans. Back when the big albums of the day were selling a few million copies, these were not purchased by a few million super-fans. Even when a band like Arcade Fire sells a “mere” 300,000 copies of an album, this does not represent an audience of 300,000 super-fans. Once a band achieves any measure of widespread success, that success hinges, somewhat paradoxically, upon catching the attention of people who aren’t really paying attention.

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