Mod to assign music to modded civililzations

[seasnake]

The title sums it up. Sukitract made four civs that are pretty solid (Iceland, Siam, Burma and Al-Andalus) but only Siam has civ music. I want to make another mod that adds a theme for each era for the other three civs. I am digging in the files and trying to parse it out but any guidance would be appreciated.