Is it the coming in July Entertainment NOW trailer?
If so the backing music sounds a bit like the Metallica song "The Thing that Should not be" toned down a little bit.
I played the trailer and let the Google voice mike search listen to it and it was a 15% chance it was the above Metallica track, there was a couple of other Google matches, but Metallica sounded the closest to my ears.
If it's not the trailer in question then have you got a link or is it the coming in July Cinema trailer or if you have a phone or tablet let the Google search microphone listen to the trailer track.
Forget the two above posts.
Where I think I have an exact match (assuming it's the TV shows coming in July NOW Trailer).
Nirvana - Heart Shaped Box.
Where the karaoke version sounds identical.