We've received a number of inquiries about where you can find the soundtrack to Civilization: Beyond Earth. After the latest update, the folder with MP3s of the soundtrack can be found here within the game's Steam directory.
If you are using the default installation configuration, the soundtrack can be found here:
C:\Program Files (x86)\Steam\SteamApps\common\Sid Meier's Civilization Beyond Earth\Soundtrack
Meanwhile, if you have a custom install, head to:
<your Steam games directory>\SteamApps\common\Sid Meier's Civilization Beyond Earth\Soundtrack
This folder is a copy of the soundtrack that you can copy out of the directory without any impact on the game itself.