Music streaming service Pandora announced this week that it has acquired Next Big Sound, a company that tracks how popular songs become online and via social networks. Next Big Sound has become a standard for measuring artist popularity through activity on Twitter, Wikipedia, YouTube and other platforms. Terms of the deal have not yet been disclosed. However, in similar data-tracking deals, Spotify paid about $55 million for the Echo Nest last year and Apple paid a reported $50 million in January for Next Big Sound competitor Semetric. Continue reading Pandora Purchases Music Data-Tracking Firm Next Big Sound