I just love the music in this game. Is there any chance will see it on GOG?

The soundtrack composer is an artist in his own right, and he likely has some say as to where the soundtrack gets posted, and for how much. He's basically worked on it for over four years, with over an hour of new sounds each time an expansion comes out.

I've personally seen it bundled with the game exactly once, and that was as part of the Indie Royale bundle over a year ago. It could happen again.

Until then, you can stream it to your heart's content or outright buy it at arcenmusic.bandcamp.com. I highly recommend at least picking up the Piano Collections album, it's one dollar and is full of piano versions of AI War and other Arcen games. It's a nice consolation prize until you have an opportunity to snag the full soundtrack when it goes on sale.

The soundtracks were also bundled in the "Humble Weekly Bundle: Arcen Games" in .mp3 and .flac format around 11 months ago.

If you happened to miss the bundles you can either buy them separately on Bandcamp as doctorfrog mentioned or simply use the .ogg files in the install directory of the game if you are satisfied with their quality.

I have the Humble version of the game but I'm pretty sure the GOG version will also have the music in .ogg format in the install directory as this is normal for games from Arcen games.

You'll find the files in AIWar\RuntimeData\Music and AIWar\RuntimeData\Expansions\[Number]\Music.

Wrong bundle. Arclight IR bundle has AI War installers, cd keys and steamkeys but doesnt come with the soundtracks

I stand corrected, I guess I must have gotten it in the Humble Bundle!

I've bought this game so many times... but only once at the $20 full price (before any expansions). Each other time I've bought the expansions, and they're generally cheap enough that the full game comes with them.

It's a really good soundtrack. A real departure from the "thousand piece orchestra" that usually accompanies games set in space.

The music for the base game plus expansion are located in their respective install folders.

Check for it there; Arcen Games is great about having the music for their games easily accessible.

Edit: Geralt_Of_Rivia posted the correct file location;

AIWar\RuntimeData\Music and AIWar\RuntimeData\Expansions\[Number]\Music.