Help finding a song on itunes

There's a great pump up song i really want on my phone from intunes. I've seen it called luz aeterna or requim or requim for a dream. I've seen different versions but they both such. On by an orcestra is way to slow and the one by clint mansell is too slow too. Then the oter one i found has a drum beat that ruins the whole thing. I'm looking for the version in the lord of the rings: the two towers trailer. Its a fast paced instramental. I need that specific version can anyone help me find this song on itunes. Search "lotr two towers trailer song" and it will pop up. I WANT THIS SONG ON MY IPHONE. Please help. Also i believe the song was originally composed by mozart

First - if you want to find it - remember you have to spell it correctly. Judging from your use of English in this question, this might be a problem.
Second - it has no relevance to classical music.
Third - It was certainly not composed by Mozart.
Fourth - It is LUX Aeterna. The version Requiem for a Tower is from the videogame and not the movie.

If the other answerer is correct, then I can't really offer anything if it's a game. The only music in the movies was the score and songs written by Howard Shore.
If you go to the iTunes store and type in Lux Aeterna… There are a TON of different pieces with that name, not just 2. You need to be patient and listen to a few of them. Gregorian Chants, part of Mozart's Requiem, soundtrack from Requiem for a Dream, different one for the soundtrack for 2001 A Space Odyssey…
Not knowing what the trailer music was for a game, the first piece that popped into my head reading your description was the much used O Fortuna, from the Carmina Burana (Carl Orff).