Over the last few months Songza has made the transition from quirky streamer of YouTube audio to a non-interactive DMCA compliant radio model with a licenced library of 11.3 million songs.  Internet radio is a crowded field, but Songza's angle is to make listening social. "The under 35 demo spends 87 minutes per day listening to music in a social vacuum," according to Songza's Eric Davich. "That experience will change, like many other experiences on the web, to become far more social and immersive."  VIDEO:

Social radio on Songza means playlists created by people: friends, celebrities and groups of users collaborating.

Here's a demo: