One week after Spotify launched in the U.S., CEO and co-founder Daniel Ek discussed his company's rapid growth at Brainstorm Tech in Aspen, Colo.The simple, legal "all-you-can-eat" music service has made waves in parts of Europe with a freemium model that lets users listen to over 15 million tracks for free, compared with services like Rhapsody and Rdio that require upfront monthly paid ...

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