Looks like a bug of some sort. Can you tell me why music plays during the scenario and then stops playing until you will restart scenario? How can I fix it? It play one track and that’s it. Then you can hear only sounds. In the main menu it’s the same thing. I wonder if their is a loop somewhere in the program which have error os some sort (false value instead of true). It’s just my thoughts.
I also must admit that I have Steam version with the latest patch (46777 if I remember correctly) and I stumbled upon this annoying issue during the Egyptian campaign in single player.