I see that Spotify is trying harder and harder to convince more subscribers to pay for the service, rather than rely on advertising income.
Tonight the new Brandon Flowers album is only available to Premium users. Spotify are [perhaps rightly so] preserving many of the advanced features and new content solely for their tenner a month subscribers.
Clearly those stations have a ad sales business model which keeps them afloat. Those radio stations would love to have the CRM information that Spotify has at their disposal, which would further help traditional sales people.
As many people in media have been suggesting for a while, New Media companies have a lot to learn from traditional media companies – many of the business models are the same.