In Dissidia...

[Tsukino]

It is called Prologue. However I mentioned in an earlier post, not all FF games feature it, it's a tune more common to FF games with a classic 'swords and sworcery' style, other FF's like FF3/6, 7, 8 and 10 don't seem to feature it as the classic orchestra sound wouldn't match the futuristic/steampunk styles these games follow.

Earlier link

It gives some musical examples of what I mean.

The tune is indeed in those games, in the endings. You posted the "Main Theme" of each, which is different for every game in the series.

Here's VI: http://www.youtube.com/watch?v=yahHXo3f3dE&t=4m10s
VII: http://www.youtube.com/watch?v=lgb6peaKCSc&t=3m30s
VIII: http://www.youtube.com/watch?v=kjpWQI0jAlI

I could have sworn I heard it during some ending part of X too, but I'm having trouble finding it on the OST.

[Scherwiz]

The tune is indeed in those games, in the endings. You posted the "Main Theme" of each, which is different for every game in the series.

Here's VI: http://www.youtube.com/watch?v=yahHXo3f3dE&t=4m10s
VII: http://www.youtube.com/watch?v=lgb6peaKCSc&t=3m30s
VIII: http://www.youtube.com/watch?v=kjpWQI0jAlI

I could have sworn I heard it during some ending part of X too, but I'm having trouble finding it on the OST.

Final Fantasy
Final Fantasy IV
Final Fantasy XI
Final Fantasy XII
Tour De Japon (Awesome)

[Konachibi]

Final Fantasy
Final Fantasy IV
Final Fantasy XI
Final Fantasy XII
Tour De Japon (Awesome)

I like the top comment on that last video:
"When humanity unites and conquers the stars, I'm suggesting this for the Galactic Imperium's national anthem."

Just think, if ever there comes a day where Square Enix decide to finally stop and close their doors for one last time, they'll think back and ask "What have we accomplished?"

The reply would be:

Some of the greatest orchestrated music ever made
Some of the greatest RPG games ever made
Some of the greatest video games characters ever made
Some of the most memorable experiences ever made
One of the biggest and most well known video game companies in history
Some of the greatest CGI movies ever made
And millions upon millions of people woldwide influenced by their creations.

That's a pretty impressive legacy, and that's just what they have at the moment, imagine how it'll read should the day ever truly come.

Just a thought.

[AmyRae]

Final Fantasy XI

It's sad to think that might actually be the best part of the Crystalline Prophecy expansion.

[Konachibi]

It's sad to think that might actually be the best part of the Crystalline Prophecy expansion.

I wish I could have managed to understand how FFXI worked instead of spending most of my time as a dead miqo'te thief, or whatever miqo'te were called back then.

Could have saved me from the 5 year nightmare that was WoW.

Hooray for my brain evolving enough to be able to adapt to FFXIV and leave the nightmares behind (b'.')b