Very interesting project 
As someone in the Media Industry there is just a few things I hope you don't mind clarifiying

- How will you protect copyright material and infringment?
Anyone can just pass themselves off to be an artist and upload tracks belonging to other artists..and claim it is for them

How will you protect these artists and what measures you have in place to verify those making the copyright claims are actually genunine..

Also in the event of this happening and say the real artist discovers that their material is being used by someone else several months later and revenue has been generated..would there be anyway of
a) Claiming the revenue back
b) Finding out the identities of those that have "Stolen" material and passed it on as theirs


Just this little bit if you can clarify would be great

apart from that excellent project