If you are talking about the trailer that has been showing recently (today is 10/23/09) then I have the answer. The song is called Nara and the artist is E.S Posthumus.
Nara by Es posthumus
The song in the Def Jam Rapstar trailer is "Hustlin'" by Rick Ross
The song is Mercy by Duffy
*"Since You're Gone" - The Cars
The song that is used for the second part of the trailer is "Immediate Music" by the band Worlds Apart. (Loto Sakurambo)
The Cold Case Theme is an extract from a tune called 'Nara' by E.S. Posthumus.
The song in the trailer is called Deep Shadows by T.T.L.
If I remember correctly then I believe the song that was played in the trailer is: "When I Look At You" by Miley Cyrus
It's not the trailer, its the theme song and the song is Sexy Ladies by Ray J.
Nara by Es posthumus
Collide by Howie Day, it's a great song!
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 in the Def Jam Rapstar trailer is "Hustlin'" by Rick Ross
The song is Mercy by Duffy
Howie Day- Collide