Thanks! I have to admit that I wrote that music a while back for a video game. Nothing much came of it and I thought it was the perfect soundtrack for this, mostly because I could use the same short themes with different style and intensity. At Defcon 1 and 2, you're listening to the music of exploring the suburbs looking for aliens. At Defcon 3 and 4, you're out in a pasture (this one probably didn't translate the best, but I still think it's more intense than the first). At Defcon 5 and beyond, it's the theme from the military complex. They're all related melodically. The opening screen and the modal behind it also share a melody, just at radically different tempos.