Songza is an 8tracks clone made by connected people in the valley, funded by connected people in the valley, and bought by rich people in the valley. Their product is not as good as the competition (8tracks, spotify, soundcloud cover everything, maybe rdio has some pretty slick features too), but still they did incredibly well...
It's weird. Most of their playlists are made by the songza team, I would love to see their numbers.<p>Anyway, if you're looking for crowdsourced playlists, I would just use 8tracks