Wind unto a Breath.
It's a great ambiance song that you have, certainly calming and the sort of thing I could lay back and listen to for hours. The hints of a choir that you have in there only make the songs so much more to be appreciated. I'm an absolute sucker for choir, so *pop* onto the favourites this goes.
This is definitely a better example of ambiance, fully blending in with it's own style of music. However, and a big however, is that the song itself need lengthening. You could have included much more substance into the song itself - since I'm the type who really gets involved with ambiance, it's sort of being left out for cold - one second you're lying back, peacefully listening to a great track and then suddenly it's over - not fair, brah. The song itself is pure brilliance, the slow buildup to the choir great but the length itself is just... ouch.
I'd suggest adding in some more turns, greater screen time for that choir, mostly working your way through the decibels, and mainly keep the song at it's peak for the longest time possible, before finally letting it go. Just try and lengthen the song out, get it going into some rhythm before letting us go like that. But otherwise, love the acoustic, the subtle macaronis (or whatever the shaking things are called) and the drums, and that choir in bloody brilliant.