I agree, but two major issues here: - licensing will be difficult without a paywall, I'm pretty sure this site is "illegal" - there is no way to keep tweaking

I agree, but two major issues here: - licensing will be difficult without a paywall, I'm pretty sure this site is "illegal" - there is no way to keep tweaking manually to correct bad sounding parts etc, which limits usefulness As it happens I work on a similar iphone app called Pacemaker, which solves both of these problems (using spotify login and a bunch of edit tools, respectively)