Use this music for an menu music (Or just an soundtrack for an Industrial Era)
This is a good musical piece yet, the industrial era track is all historical classical harmonies. I'll leave it to others to discuss what the menu music should be.
I know I have suggested some 'game' music for the digital soundtrack because I think forboding/electronic sounds within reason suite the scene. Classical music has also evolved into the present but I am also not sure how it suits the feel of the 21st century. That is why I recently suggested using music from a famous Russia opera because the way the digitalized sounds are presented still follow some kind of musical theory. I still like the basic premise of using 'classical music' as much as possible. I think one of my reasons for all my proposals, however, has been to try to define what 'classical music' actually means for nonwestern cultures or for instrumental music which is being made in our time (and the hypothetical future). For some civilizations, this is clear cut for East Asia all of the historical nations had their own brand of official music- with Chinese Classical Music in particular still evolving while the middle east in clear reliance on Iranian and even Al Andalusian traditions (to best of my knowledge). South Asia has a very rich tradition but at least to me its confusing to track down the names of their great works- and their soundtrack seems appropriate and very long already.
One can raise the question did Sub Saharan Africa and the New World have their own 'classical music', I am pretty sure if an ancient Mayan or Aztec aristocrat could answer that question they would say yes, but due to lack/or destruction of documentation this is not the easiest to find. Also since the 'tribe' is a part of history and even represented in the game by the first civics one could argue that authentic tribal music also has a place in official music history (which would allow for Bantu and NativeAmerican/First Nations selections). I have to tried to find the best music which are not new age spin offs of historical cultures - with some exceptions. Also, I acknowledge, that despite feeling more and more as a simulator all the time RFC- DOC is still a game and the music should not be too jarring for modern ears. Whatever the music is- its need to be good quality files and to sound good. This is another reason why copywrite restrictions would really damage this effort because much of the historical public domain files I found were taken from 1950s records that just don't have the best sound that they had once enjoyed.
I have listened to a great deal of Civ V music in why much of it feels authentic for certain eras much of it was still specifically composed for that game (except for the European tracks which often did come from historically composed tracks). I certainly don't mean to shoot down your good suggestion Malayan Gamer but in my individual opinion, Civ V seems to have a drastically different feel apart from the earlier civ games. It may be best included as an optional menu track.
In my suggestions, I tried to follow Steb's model of expanding on what was 'official' music that represented different parts of history. For the most part- popular music (even older kinds such as sea shanties) were mostly avoided.
Of course its up to Loreth to make the final decisions. I haven't gotten to create a pull request for expanded music modules. Ideally, it will propose a new digital era soundtrack, a new classical era soundtrack, a new Precolumbian Music soundtrack, additions to East Asia's music and some add ons to the Middle East and (maybe) Medieval Europe. I could so easily get carried away with my wishlist so I am trying to contain myself here. I have to make sure that it dosen't get to be more than 1GB as it very easily could accumulate. I also don't want Loreth to say 'this is way too much' and turn it down as a consequence
Ideally, I think my proposals should be linked up with the Global Era music module which was uploaded by Steb about a year ago.