Apologies, I didn't realize that there already was an active thread about this! Zero-project has some of the best game soundtracks I've found on the internet. In Santorini, The Great Spirit, Celtic Dream, Land of Legends, and Warrior's Honor seem perfect for the Prehistoric era, and Escape sounds like it would fit nicely in the Modern. In Albums/Autumn prelude, Nocturne and Eternity would be incredible to hear in the Galactic era.
Take music from other mods. RFC Europe has some of the most amazing soundtracks I've heard in a game, but they are sometimes too Europe themed (church music and ballads). Still, it's worth looking at.
Uh, I also think that this fits quite well for the ancient era. That's all I can think of right now. Personally, I use tracks from Europa Universalis III and Europa Barbarorum, but I don't think that those would be ok to use "officially."
Take music from other mods. RFC Europe has some of the most amazing soundtracks I've heard in a game, but they are sometimes too Europe themed (church music and ballads). Still, it's worth looking at.
Uh, I also think that this fits quite well for the ancient era. That's all I can think of right now. Personally, I use tracks from Europa Universalis III and Europa Barbarorum, but I don't think that those would be ok to use "officially."