[Izzmo]

I actually made a script A LOT like what you are thinking of a while back for someone. He ended up cancelling the idea because he didn't have any more money to back it.

It was PHP and was about Video, but you could easily put audio in it instead. It had a Moderator panel, admin panel and all of that, but user registration and comment system with the ability to blog about things (news module) and on the homepage was a "what's been added lately" kinda of thing.

Was a year in the making and just ended, kinda sucked for me, except for the free hosting.