Indeed, some sound quite familiar. At least one of the general purpose battle tracks is from Civ5 and several from Heroes5 (or 4?), though I can't remember where the others are from (and some I haven't heard before).
Btw, one track reminded me of
this spectacle (actually, I think it's called "Opheus and Eurydice" (or was it "The Bulgarian legend"), "Dream Dancers" is probably the ballet's name). I know its composer (he's also a director of the "Filip Kutev" national (folk) ensemble), though I doubt we'd get permission, considering the spectacle is probably still active. Anyway, some of the tracks might fit quite well, including 1-2 more "battle-like" ones (like the one
here, though they sound rather tribal as well).