The song used in the trailer is "I'll Try Anything Once" by The Strokes.
Somewhere Only We Know by Keane
If you are talking about a slower song that ends in "...somewhere only we know." Then, it is called, "Somewhere Only We Know" by Keane. It is on iTunes, you can purchase the song there.
Somewhere a clock is ticking- Snow Patrol
The song in the trailer is called Deep Shadows by T.T.L.
It's not the trailer, its the theme song and the song is Sexy Ladies by Ray J.
If I remember correctly then I believe the song that was played in the trailer is: "When I Look At You" by Miley Cyrus
Linkin Park - The CatalystThis is the song that you hear on the TV trailer's.
It just depends on what trailer. But the campaign trailer #1 is part of the HALO Reach soundtrack and the song is Lone Wolf.
The song used in the "Clash of the Titans" trailer is "The Bird and the Worm" by The Used. It was specifically created for the trailer and is not an original soundtrack in the movie.
The song is Mercy by Duffy
The song in the Def Jam Rapstar trailer is "Hustlin'" by Rick Ross
Somewhere - song - was created in 1995.