Two things in this world I have soft spots for are the Civilization franchise, and study music. Incidentally the two cross over really well. The Civ series incorporates classical music, and as a result makes great background noise for studying. A few months ago I created a very incomplete Spotify playlist of music from Civilization V and it has picked up a number of subscribers, so maybe it is worth sharing? The fourth game's music is just as worthwhile, and includes Jonh Adam's Shaker Loops.
Unfortunately, there are a lot of in-house music that is missing from this playlist. Field of Poppies is a stand out piece all on its own, as the title suggests, it invokes the imagery of a serene field of poppies waving in the wind. You can't find this music on Spotify, but if you buy the games you can extract them uncompressed no problem. A few years ago I got the game complete with expansions on Steam for $19.99, and it is possible that you can get it for even cheaper now, especially during a sale season. Then all you have to do is go to the music directory, which is located (if you bought the game on Steam, and installed it into the default path) in: C:\Program Files\Steam\steamapps\common\sid meier's civilization iv beyond the sword\Assets\Sounds :
|Civilization IV Music Directory|