The song in the choir background is "Down in the river to pray", made famous by its use in the Coens' O Brother (here is a version from Alison Krauss : https://www.youtube.com/wat…

I agree with most of this review, except the part about the "final montage that badly wants to echo the chaotic visual and emotional frenzy of the climax in "The Rains of Castamere".