If you're wondering what song is playing at the end of the Salmon Fishing in the Yemen trailer, it's "Heartbeat" by The Fray, who are best known for their singles "Over My Head (Cable Car)" and "How to Save a Life." The track is from their 2011 album Scars and Stories. Here are the lyrics to the fragment of the chorus that is heard in the trailer...
Oh, I feel your heartbeat
And you're coming around, coming around, coming around