Soundrop, the Spotify app turned collaborative listening platform, has secured another $3.4 million in funding from Northzone and Investinor. Soundrop offers Spotify users listening rooms that can best be described as a mix of Turntable.fm and Reddit. The Norwegian startup was the first maker of a Spotify app to receive funding back in June of 2012, and has since launched listening rooms on Facebook and the web as well.

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