Predicting chart success is an impossible science. Every year, the surest things with the burliest marketing budgets tank while out-of-left-field oddities -- no offense, Magic -- earworm themselves into our brains and stay there for weeks and months.

Even established stars rise and fall in ways that cannot be predicted. This year, Taylor Swift defied conventional wisdom by completely bypassing country radio -- and her roots -- and courted a fickle pop audience by going door to door with 1989. Not literally, but nearly so.

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