Stories from the Outbreak soundtrack - 8 in-game music tracks and jingles made by Roman Lamcev, provided in mp3 format. There is also a track from the game ending "P奴t, V膿ji艈i," made by L墨va Priede.
The soundtrack is going to be available in your library and on the game page itself under "Additional Soundtrack", but in case you want to access the files directly: right click on your game in Steam library, select "properties" -> go to "local files" tab -> click on "browse local files." The soundtrack is located in the game's "Soundtrack" folder.
