I think responses like this are missing the forest for the trees in the idea being proposed here.
Let's take a step back. The context of the idea is a dying traditional music industry; most of the old business models are failing. In the old models, there were a number of large marketing and distribution networks who collected the sort of data Keating is asking for, and used that data to inform their marketing and distribution efforts. An organization in the business of successful music sales needs to know the size, makeup and geographical distribution of the audience. As those organizations become increasingly irrelevant, the capacity to make those informed decisions is to some extent decentralized, but also to a large extent in danger of vanishing entirely.
What Keating is asking of "internet radio" (Pandora being a major source of her exposure, but it is really a clarion call to the changing music industry) is to recognize the fact that artists are becoming more and more isolated and atomized, and to create a business model that represents that. If any of the businesses currently "in the game" want to be relevant, they'll allow artists (to the extent they're motivated and willing) to act as their own respective businesses, and do a lot of the work that the old marketing and distribution channels no longer can or want to do.
And it really is a gift to the industry players to publicize the idea this way. The alternative is to build the new model in relative obscurity, grow it and supplant the current players. The idea is about more than data, but that data is central to its success. The real idea, at its core, is that the new model (and she touches on this in her blog post) requires a great deal more individual initiative on the part of artists. And whatever you may think about "whose data is it?" and the fairness of the request, a music industry can't survive if artists fail. A successful, modern music industry would help to foster all of that atomized effort in a productive way. And isn't that, basically, what most of us have been asking for since we saw the writing on the wall for old music business?
Keating and other enterprising artists want a venue to reach their fans. They don't just want this, they require it for commercial success. We, as music fans, require the artists' success for our lives to be enriched by the music. A team of enterprising developers could provide this in a relatively short time (relative, at least, to the pace of the old industry's death), and pretty much steal the show. As Keating says, the new model is supposed to be peripheral sales, the music being the driving force behind those sales. Providing what Keating has asked for is not a concession, it's a recipe for success.
As an artist myself, I've imagined creating a tool of this nature. It's not enough to have a place to upload music files and artwork. It's not even enough to have a couple of form fields to link to the artist's blog. A lot of the elements of a powerful new business model already exist, but they're woefully unintegrated. What artists and fans alike need is a way for everyone to get connected, in a very distinct way from the existing social networks. Artists are businesses in this model, and anyone who empowers them to act in that capacity stands to win the day. And I think we'd all be better off for it.
As a developer, I'm unfortunately indisposed with other work too important to me to pursue a business like this, but I thought it would be helpful to share this perspective in case other developers are reading and want to create the next big thing in music. That thing is: create the tools that artists need to reach their audience. Giving them data lets them adjust their own marketing efforts, their own performance efforts, their own merchandise efforts. Everything else is icing on the cake. These tools are force multipliers, and the more you can accommodate those efforts, the more artists will succeed and the more they'll choose your service. And fans will follow, not just because that's where the music is heading, but also because that service would provide more of what fans want too. Why would I choose the noise of "radio" when there's something better?