Era Specific Music

It's an idea that's been toyed around here for quite a while - but is something like Era Specific Music doable?

Or even a single track that is played upon entering new eras (based on culture groups).

I suspect, but haven't tested, that you can add an Events.AudioPlay2DSound() call to the NewEraPopup, and if IsMusic is set to true for the appropriate Audio_2DSounds entry, it'll change the background music to that track rather than playing it as a sound effect over the music. Then after that song is over, it'll go back to the regular music rotation... I think...

The latter is definitely possible.