Anything by Sabaton (They're a power metal band that mainly sings about famous battles and the like)
Primo Victoria (about D-Day)
Firestorm (about carpet bombing in WWII)
Birds of War (about fighter pilots in general, I think)
Also, Manowar's Warriors of the World is good.
I occasionally listen to old Soviet songs while flying as the Russians.
White Army, Black Baron is really epic:
So is Echelon's Song (though it takes awhile to get going)
I would have hyperlinked all of these, but I fail at technology, lol!
Edit: I guess it embeds on its own...... I
really fail at technology!