Pop tarts are aggressive..?
Regarding the national anthem, you should look up a translation of the French national anthem. And it probably isn't the most metal/aggressive national anthem out there, since it's one of the very few I even know.
Edit: I couldn't help but add this snippet
Grab your weapons, citizens!
Form your battalions!
Let us march! Let us march!
May impure blood
Water our fields!
Full lyric translation: https://www.thoughtco.com/la-marseillaise-frances-national-anthem-4080565