I have checked the store pages and don't see any mention of the soundtrack. Can anyone clarify whether this is included in the base game, DLCs, or expansion pass?

The soundtrack as far as I know, is a separate, DLC purchase, at least on other store fronts. It does not appear to be purchasable on GOG yet.

For anyone still wanting to know, I have confirmed that the soundtrack is not included at this time. I purchased the game and expansion pass, and after installation don't see the soundtrack anywhere

What is gog's deal with not giving a shit about soundtracks?

No soundtrack for GOG version not even as a separate purchase.

I really wish I could buy it.

I love DRM free but when when these things happen, I don't want to support GOG, we are always less important buyers.

Sorry for my bad english.

The soundtrack is now avalaible,

Thanks you GOG Team and Obsidian.