Myself I´ve added "Fortuna Imperatrix Mundi" from "Carmina Burana", as I found it fitting with the European battle music.

Now, I´m checking van Dyck's page, and I çuite like some of the newer games sound files (the choral/music ones, not the ones featuring distinct lyrics), might just add them.

Still, Euro Mobilize 2 from MTW remains my favorite :p