Really fascinating. I actually always wondered if Romans had anthems and marches, and what they'd sound like, especially a parade of legionnaires (in the Republic era, the Augustan era and the Constantine era) what the marching songs would sound like.
The music on the webpage (audio samples) are really awesome and really give a feeling of antiquity times and would make the already very impressive mod even more so. Most of it would be campaign map music, it'd be great if the group composed a Roman marching song.