As far as final battles go, you just don't get any more sinister than Ogre Battle's. And it has the music to match.
The final boss, the Big Bad of Ogre Battle, the one guy you have to defeat to prevent the destruction of the world, is--wait for it--Satan.
No, seriously. Satan.
Technically he's called "Diablo" in the U.S. version; that's the Spanish name for Satan. There is no question who "Diablo" is supposed to represent. The presumed Big Bad, Rashidi, with his Dragon, Gares, take off at the very end of the game to a super-secret dark temple where you have to race to track them down (OK, not really; you can take forever if you want, but the story makes it clear you're supposed to hurry) before they summon Satan. Which they're doing pretty much out of spite, because they're pissed off the Rebellion showed up and authoritatively kicked their asses. Stay classy, Rashidi.
Anyway, you might expect--I did--to show up just in the nick of time and deliver one final beatdown to Rashidi--but no! You don't show up in time, and you show up just in time to confront Satan.
This is the theme music, then, for your battle with Satan. And it works. The music is, simply put, very evil, and very intense.
Incidentally, if you use an appropriately pumped up unit and bust out your full deck of Tarot cards, Satan is kind of a pushover. But then, everyone is, by that point in the game.