It was the best of times, it was the worst of times: Our guest Chris Molanphy says 1991 was a tale of multiple cities, as radio stations began to tailor their playlists to narrower audiences. The result? Little crossover among the Billboard pop, rock, and rap songs charts, and a very eclectic Hot 100 chart. Molanphy writes Slate's "Why Is This Song No. 1?" column.

For the Spiel, Mike cleans out the fridge before vacation.

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