Ah I see. Well I can't find anything that enables it, which is a shame. It doesn't appear to be a set list of tracks for the map screen, more a combination of a very long exploration theme with a few race-specific tracks. I can only associate the Iconian music with event screens or something around that area though, so I think there might be some exceptions.
If you can't understand what I'm saying, then honestly neither can I. Sometimes things show in game that I can't even find in the game files. Yet.
And agreed! Weird that a thread with literally 2 active posters might have stumbled on a type of addon I've not seen packaged for GC3 before. It can be our secret until, what is 'suddenly' to everyone else, some mods arrive
Anyway, if it goes to plan I'll make a template mod if someone doesn't beat me to it.
On top of that I'll make soundtracks for my own custom races. Along with a custom tech tree, shipset, UI colour scheme,-- and OH, I accidentally found out how to make animated leaders and backgrounds while I was figuring how the vanilla major races have their own music! ...Anyway as I was saying, all those things packaged together will make for a very immersive major race mod.
I can make the music myself I think, and/or give it to other people to use in their mods. I usually put off music after a while of failing to instil emotion, but I could make a very long soundscape sci-fi sounding thing easy! (And give it a quick license )