
I have the feeling, based on the fact that there is absolutely no information about any licensing deal or even basic company information, that this is an unauthorized use of copyrighted material. I suspect that the library is simply a very large music collection sitting on a server with a nice looking Flash UI tacked on. See the comments below for additional information. It certainly is fun, but I can’t imagine it will be making the RIAA and its worldwide counterparts very happy. Enjoy it while it lasts.
The service has an associated blog here, and Myspace page here.