Without Spotify, labels know only when an album is sold. If a CD is ripped for a friend or borrowed for a party, they know nothing. Spotify gives them a record, by location, age, and gender, of every single time a track is played. Jay-Z used to think he was big in London, based on U.K. album sales; it turns out he’s big in Manchester. Spotify has discovered that radio plays—on real, terrestrial, electromagnetic spectrum—still drive interest in artists, as do Sweden’s summer talk shows. Sundin has a Spotify chart tracking Rihanna and Lady Gaga over seven weeks. Both show a bump on Friday and a spike on Saturday. They are weekend artists. Spotify knows when your party plays Gaga.

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