OK, we'll try this again. This video is from one of my favorite anime's - Full Metal Alchemist. The person who created this AMV did a very good job editing the music and the clips. It's the best one of this song I've found.
This clip gets pretty graphic (as you will find with most anime). It is done artistically well, but it is not intended for children.
Basically, in this world, you have alchemists. When the boys were younger, they tried to "resurrect" their mother, and paid a high price for it. The older brother, Ed, lost and arm and a leg. His younger brother, Al, lost his body. Ed worked fast to attach his brother's soul to a suit of armor. They realize what they've done, and spend the rest of their childhood honing their alchemist skills to battle the monsters that were created when someone attempted to bring another back to life.
The story line is one of the best I've seen, and it is very unfortunate that the series ended.