It is not Mars, Bringer of War. I have listened to Holst nonstop for the past month, and can tell you that piece is not it. Mars, Bringer of War is composed in 5/4 time, which is way different. Actually, as soon as I heard the begining of the music, I immediately noted that it was the same music from the movie Trinity and Beyond: The Atomic Bomb Movie. If you don't believe me, go rent the two and compare for yourself. The composer should be William Stromberg. I believe they call the piece Hiroshima/Nagasaki Requiem. In fact, if you run a Google search for "Hiroshima Nagasaki Requiem", you find find dozens of sources that back me up on this one.