It really depends on which trailer you have watched.....
If you are talking about the song with words in it (a woman singing), that is called "Rolling In The Deep" by Adele.
If you are talking about the other song (guy singing) it's called "Curfew" by Beck, but sadly can only be heard in the trailer and movie.
And finally if your talking about the techno-ish song in the trailer, I have looked all over to find out what it's called and still can't figure it out.
Hope this helps!
Somewhere a clock is ticking- Snow Patrol
the song that plays is run this town by rihanna ft. jay z
Hoppipolla by Sigur Ros
The song is called Breathe Me by Australian singer Sia
its Adele rolling in the deep
The song is called "Mad World" by Gary Jules
Andrew Bird- Don't Be Scared
Lifehouse-"Broken"
The song that plays in The Walking Dead video game season 2 episode 2 trailer is "In the Pines" by Janel Drewis.
The music for the trailer was created by Sunday Entertainment. More information can be found at sundayent.com.
tick tick boom- the hives
Opposite of adults by Chiddy Bang