Songza Music Streaming App Nabs 2 Million New Users Since June With More Than 50% Retention Rate You’ve heard me talk about Songza before. After launching on iPad, bringing Concierge to Android, and surpassing 1 million iOS downloads in 10 days, the company is still on a roll, announcing that more than 2 million users from the States and Canada have joined Songza since June 1st. But perhaps more i