Will never happen due to royalty demands by record companies (which would probably double the monthly AH fee).
Just like the did in Silent Hunter 3 +... let me tell you, that ruled when playing.
There's nothing like doing 350+ in a dogfight and listening to Beethoven and Mozart. Those are definetely free of charge to use. And why not? If you can turn it off, that's great. Another great Public Domain dogfight song is O Fortuna http://www.youtube.com/watch?v=hrML6s1wNHk. And the rock version http://www.youtube.com/watch?v=hrML6s1wNHk (not sure about the freeness)-Penguin