a few soundtracks for Brazil -
The national anthem of U GIB MONI
the famous BR? HUEHUEHUE
or maybe even the I REPORT U
joking aside, it will probably be Samba of some sort.
I'm loving the League of Legends reference.
But bossa nova es #1 HUEHUEHUEHUEHUE.
I believe that the tradition in Civ 5 is to base both the peace theme and the war theme on the same music piece. For example, both Germany's peace and war themes are based on "Ode to Joy." So, sadly, we will not be able to have two different songs as the basis for the peace and war themes.
On the plus side, it's pretty amazing how, in the case of the war themes, they manage to twist something peaceful and/or playful into something epic and intimidating (and epically intimidating). Such as Russia's war theme, based on Prokofiev's Montagues and Capulets, and the awesome French war theme, based on the cancan (!)
I can only imagine what bossa nova-themed war music for Brazil would sound like. We can call it...combat bossa nova.