I would also like to know what the music was. Carl Harms is mentioned in the credits but not sure how much of the soundtrack is his as I spotted a fair amount of guitar work from the (excellent) Mumford and Sons' Sigh No More album...
Not sure of that exact scene however these are the tracks I recall.
I think the sound chap has been raiding my CD collection, some great tunes here!
Ones I can remember are...
Voices (acoustic version) By Dario G
Smoke Belch 2 (beatless mix) The Sabres of Paradise
Glasgow Love Theme by Craig Armstrong
Low Sun and Early both by Chicane
Svefn-g-englar and Hoppopolla both by Sigur Ros
The Cave by Mumford and sons