Main Menu Music-Where to Get it?

[Kολοσσός]

Where do I download the music theme from the main menu immediately after the game launches? It's cool.

[Raygereio]

You don't have to download it again, you already did when you got EB. Go to:
[whatever instal path you chose]\Rome - Total War\EB\Data\Sounds\music

In that folder "EB_Main_Theme_WIP.mp3" is the one you want.