Hey Joe
I'm sure we can build something great here.
The website mentioned in the youtube video is quite feature rich (leases, contracts, coupon discounts, graphs, and much more).
This bid does not cover all that. It covers only the features you asked for, basically: user registration, subscription based membership, mp3 upload, paypal payments.
After finishing this project, we can add the other features if you'd like, but that would be another project.
I can develop and install everything on a server I own, so you may preview/test everything before it goes live.
Let me know if you have any questions.
Thanks