...and that's where you lost me.
Global radio doesn't work. Hundreds of companies and thousands of people have tried it, and it's never worked. People are different all over, they're not the same, so they don't all want the same thing.
I stopped listening to the BBC World Service when it stopped being about Britain and started being "The world's radio station™," because it just got boring and repetitive.
"Centralcasting" is what almost killed radio in America the 1990's. Jacor/Clear Channel ate hundreds of stations across the country and had a computer in Kentucky decide what music should be played for an entire nation. It didn't work. People flocked to iPods and streaming to get away from the homogeny. Those stations that kept true to their local content survived, and some thrived.
Even Sirius learned this with its satellite radio stations, and the DJs no longer pretend to be some monolithic continental presence in the sky, and instead talk about wherever they're broadcasting from, and some even bend the playlist to match their geography, so it changes through the day as they switch from a host in Detroit to one in Boston to one in DC to one in L.A. When I was in broadcasting it was called a POD — Point Of Difference. Why can DJ A give me that DJ B can't?
KCSN/Northidge and WXRT/Chicago are both AAA radio stations, but they don't play the same songs. They're tailored to what their LOCAL audiences like. That's a good thing. Apple Global Mega Huge Music One has no local audience, and zero feedback other than a subscriber count.
When I listen to a pop station in London, I hear different music than when I listen to a pop station in Los Angeles or Melbourne. That's good. I listen to music from stations all over the world, and in genres I don't ordinarily like, simply because I enjoy the discovery of new songs and artists that I never heard of.
Apple has enough money to keep this online for a very long time, even if no one listens. But why? Who is it good for? Aside from a branding exercise, or trying to give one more checkmark for its bundled services package, what's the point?