It's a cool site, and an amazing accomplishment for a side project, but I really, really have to ask: why did you spend your time building something to add to the hyper-saturated, money black hole that is the music listening/discovery app market? I mean, there are, and have been
so many sites like this that have either survived on the border of illegality or have been shut down. And we've got a whole host of above-board legal streaming sites now that are dirt cheap and have a wide variety of music to listen to. What's new here and why should I consider using it? Why will this be around in 6 months and not just die after you run out of money to keep it up or get sued? I'm not asking this to be a dick but I really don't understand why I see a new one of these sites get released every few months that seems to do the same thing as all the others except is free (and probably illegal) or thinks that slightly better music recommendations or "social listening" is a sustainable competitive advantage.
edit: Ok, read your blog post, but I guess my question still stands. The improvements you list are fairly marginal improvements over existing stuff IMHO and it seems mildly crazy to put in so much effort to replicate existing sites but add things like responsive design or slightly better Facebook integration. Good luck and I hope you end up turning this into an amazing success so if you can turn me into a believer I am listening :)