I am desperately requesting the music from the following trailers:

Mass effect
http://www.gametrailers.com/player/21470.html

Quake 4
http://www.gametrailers.com/player/6290.html?type=wmv

Crysis
http://www.gametrailers.com/player/27394.html

FEAR
http://www.gametrailers.com/player/16350.html

I would really like the music used for these (not fussed about quality), please and many thanks.

I only know the song from Mass Effect trailer. First one from the beginning till the 0:43 is from Mass Effect OST (Breeding Ground I think)
Thread 47659
But I guess you are trying to find the other one, on the end of the trailer...and thats Trinity by James Dooley
http://www.krazy-kreations.com/spiderman/sounds/Trinity-JamesDooley.mp3

Enjoy :)

Yes, thats it thanks you so much!