After many reinstalls, tinkering and randomness... Music is working for me... Sometimes. I guess it's something.
UPDATE 2: It was on my sound card, using another one did the trick.
But I'd like to report a bug: I am able to set the game at 4K/2160p once in-game, but game won't start next time I run it. I am forced to set any other resolution within the launcher and then go 2160p once the game is running. I tried 4320p out of curiosity, and game just crashes when I select it.
Another bug: Whenever you are reading a document, intelligence, or consulting a map, the game stops grabbing the mouse cursor. If happens to be on my 2nd display and I click, the game minimizes.