As I was watching Platoon for the 297th time last night, the background music finally prompted me to find out more about it. Turns out it's Samuel Barber's Adagio for Strings. I wanted to hear it again, so a video search brought up this video as the top result:
Wow. The background of this piece is that it was performed by the BBC Orchestra on September 15, 2001 at The Last Night of the Proms at The Royal Albert Hall in memoriam for the terrorist attacks on the eleventh. This selection was unusual because it replaced normally upbeat and patriotic songs.
The author of the video mixed shots from the performance with visuals from ABC's Report from Ground Zero. I know we've all been through the anniversary of 9/11 earlier, and this is kinda late as far as that's concerned, but I challenge you to watch this video and remain unmoved.