I don't know any of the words to the song or who it's by or anything. It's a really popular track used in video game commercials, movies, tv show, etc... It sounds like it is something from the opera where a choir is singing it. the only part of the song that I have heard is the same chorus repeated over and over. It is usually played in a real tense scene when it is used. That's about all the info I can give you since I don't know anything else about it. Your help will be greatly apreciated. Thanks in advance.

I think you are referring to an Itallian song. I know there is a song that sounds a lot like it on the soundtrack for the Funeral. I think it is the first track on the soundtrack (by the way, it's a great movie). But I know the song you mean and have no idea what it's called. Anyone who knows, please also post the easiest way to acquire this song.

I did a search on audiogalaxy and John Williams' Dual of the Fates came up. Could that be it since it has been in a lot of movies? If not does Beethoven's Funeral March or Mozart's Requim sound familiar?

You're most likely thinking of Carmina Burana from Carl Orff, specifially the "O Fortuna" track.

The only movie I have ever heard "Duel of the Fates" used in was Episode 1 The Phantom Menace. And it does not sound like Italian/opera music but it does sound like choir music.