War Pigs by Black Sabbath. :D
well if its the one im thinking of its called " how it ends"
DeVotchka - How It Ends http://uk.youtube.com/watch?v=MbZM6ZSlvvY
DeVotchka - How It Ends
Unfortunately Gears of War by Megadeth was never featured in the game Gears of War because the song was not entirely complete but when Gears of War 2 came out the song was never added into the game because of the lack of communication between the Microsoft and Dave Mustaine
Mad World
the surfing bird
The song is "Heron Blue" by Sun Kil Moon.
There are many Gears of War 1 and 2 trailers that have different songs in them. The most famous has to be a Gears of War original trailer with the song, "Mad World" by Gary Jules. This was the first trailer for Gears of War ever that shows Marcus going into the dark and then finding that he walked into a monsters trap.
"How It Ends" by DeVotchKa
The song is called "Into Dust" by Mazzy Star.
gears of war is the best but gears of war 2 is better