Very cool. Sounds like a Hype Machine for hiphop. My advice: build in reporting/analytics capture into your code early, and solicit user feedback aggressively. Good luck!
As for analytics, do you recommend anything more advanced than simply Google Analytics?
Feedback: This is just me, but I'm too lazy to copy your email address, switch programs/tabs/whatver, paste, type, and send. Give me a form. Click-type-click. Plenty of people might just want to say 'hell yeah' without giving their email address. You can't buy something like that, and it's the kind of thing that will keep you rolling.
I'm listening now. This is great. If you want a quick brain dump on online ads I'll send you my email address.
I recommend using http://mixpanel.com for your analytics.
For feedback, have various "thumbs up / down" as part of the site. Ex: Does hiphopgoblin rock?, etc.