While I'd love to be able to listen to any music I want anywhere (who wouldn't?) I do think this has a high chance of compromising the game's soundtrack. If you can always listen to your favorite song, when are you going to listen to the new stuff?

So if they did this, I feel like it would have to be restricted to areas from previous expansions, and then everyone would be mad it wasn't available elsewhere. And people with primal mounts would be annoyed that the music part isn't special anymore. But I don't have any of those so I'm all for it.