DragonForce/WMG

Operation Ground and Pound is actually talking about The Avengers.

 * Specifically, the massive battle near the end of the film, with Loki or  being "the evil one".

Every DragonForce song is about an army of ghosts who fight each other eternally after every other living thing dies.

 * The Valley of the Damned is actually the Valley of Megiddo.
 * The "master" referenced in a few songs is either Jesus or the Anti-Christ. Possibly, the army doesn't even know which side it's on (Our only master with fire and fury of hell will see his bidding done in Soldiers of the Wasteland).
 * They believe that they'll rise from the dead when (The second age is coming/It's the dawn of a new day/Judgement stands before us/The second king will rise in Revelations). Jesus is the "second king", but he will never "rise" because he's already been defeated.
 * They can fly because of the powers granted by their undead state. They cannot die because, obviously, they're already dead, having been defeated during Armageddon, but they can't rest because of their absolute devotion to the idea of defeating all evil.
 * Alternitively, they are killed and ressurected over and over again (Screams of pain in death descending, rise again from Hell defending in Operation Ground and Pound.

The narrator of DragonForce's "Heart of a Dragon" is Eragon. (Or the song is inspired by the book.)
First, we'll cover the chorus: "Proud and so glorious Standing before of us Our swords will shine bright in the sky When united we come To the land of the sun With the heart of a dragon we ride"

The "we" in here is the  It is the opener for an epic battle.

Next we'll cover this stanza: "We are flying on wings in winter sky With fire burning deep inside We are warriors of endless time forever and on

On wings of steel an ancient flight We see the powers that unite The gods will now send us a sign of battle once more

Through the valley we ride Full of glory we soar Where the fights will be raging For now and for more

When united we come And divided they fall Tonight you will witness it all"

Most of this song is about the  The "we" in this part is Eragon and Saphira. The "valley" mentioned here is the huge valley of the Beor Mountains.

Adding to the above theory about Eragon: I believe that the song is about Inheritance. The

Dragonforce's music is powered by spiral energy
They only pretend to be using computers. In reality, they're using the power of spiral energy. They haven't told anyone because they don't want to be attracting the attention of the Anti-spirals. What? They're Hot-Blooded enough.

The DragonForce song "Through the Fire and Flames" is about Armageddon. Also, "Heroes of Our Time" is about going to heaven.
Seriously, look up the lyrics for those songs.

This troper has a theory that Dragonforce is the result of a project to build a time machine.

"Fury of the Storm" is about two snow clearers doing their job while listening to Dragon Force (video game)
So this guy and his buddy are clearing snow off of a road in a pickup truck, when one pops a Dragonforce album in. Proof?

"Power through the ice and snow forever more" - they're doing their job

"Here we are the chosen ones we cannot fail now" - Well, people will be pretty annoyed if they don't clear the snow.

"Killing all the mortals down the winding road" - they're too busy rocking out to notice that they ran a few people over.
 * Ok, this is the greatest piece of writing I've read today.

Black Winter Night is set in the world of A Song of Ice and Fire and tells the events after the Others have breached the Wall
As the world falls to the Others, the remnants of the Night's Watch fight their last hopeless battle. The song was written by one of the watchmen as an ironic comment on their "glorious" demise. The proofs include:

"Day after day as I bodies slay (...) The fallen ones and forgotten souls / Will rise up over the slain" - refers to Wights. The watchmen are fighting endless hordes of undead, and every fallen human will eventually join the Others' army.

"Rays of sunlight now are gone / Only visions of ice will remain" - The eternal night is coming and the world is slowly covered in ice and snow. Both of those happened during the period known as "The Long Night", when the Others conquered most of Westeros.

The song praises the "power of night warriors", while at that point Night's Watch consisted mostly of criminals forced into it. It also references "the almighty sword" - probably the Lightbringer, a fiery sword which was supposed to be wielded by the hero who will defeat the Others, but unfortunately "the flame has died forever" and there's no more hope. Finally "the master of all evil sign" may refer to the Great Other from the R'hlloran religion - the watchmen would be familiar with it, considering.