I always thought the screams, first responder sirens, alien gunfire, explosions, and air raid sirens were part of the background noise, not part of the soundtrack, but it cuts once you enter combat in Terror Site missions. Also, when in Terror Site missions in a harbor, you can still hear boat horns, despite boats not available due to either being non present, or being destroyed by the aliens.
![Starcraft 2 OST Space Battle 2 [Extended]](http://i.ytimg.com/vi/Qqf_90R287Y/mqdefault.jpg)
Balkans at any point in time
I always thought the screams, first responder sirens, alien gunfire, explosions, and air raid sirens were part of the background noise, not part of the soundtrack, but it cuts once you enter combat in Terror Site missions. Also, when in Terror Site missions in a harbor, you can still hear boat horns, despite boats not available due to either being non present, or being destroyed by the aliens.
The people might be scared, but they also wanna listen to the banger combat music! That's why they start shutting up! :'D
That siren