Sadly I never really listened to any of her shows, as there are all on too late at night/ early morning for me. I wish her well, and I really like that tribute/message.
Just read a Tweet about it. Apparently you can go and get it now, although the Game Center feature is broken because of all the users trying to access it.
I don't think a lot of people know what the song is actually about. It's serious stuff really. As to the actual song, I think it's alright, but again, it's not something I would normally listen to at all.