As I've been gearing up to start a Zeitgeist campaign, I've been trying to collect suitable theme music for it, and I've been wondering if anyone else had favorites of their own. Perhaps unsurprisingly, I've found bombastic trailer music such as that found on Two Steps from Hell's Invincible album to get me in the mood for action sequences. But I was surprised to find that the original Gears of War soundtrack had dark orchestral qualities that I found to be very appropriate. What about the rest of you? What music do you think would make a good "Zeitgeist soundtrack?"