awesome idea for a comp O'tition, and series of compos!
i might have to see what i can come up with; been researching.
dunno if you super badasses need/are-aware-of
this info, but it's a quick rundown of the different styles of real-world nat'l anthems; relating to cultural differences, time of origin, type of gov't, etc.
and the site's got a crapton of midi's and lyrics [at least one per country, alotta the west has multiple for different eras] to get an idea of the styles.
not that in your world it has to follow guidelines [just some inspirado that helped stir my imagination], cos if that even happened in the real world we'd all just have different lyrics for god save teh queen.
that being said, now i can't get the image of some royal in arabia arriving to the chrono trigger victory music outta my head.