This is what i could figure out from the 1:30m preview I found. The song is played 
on a mandolin, i think. The instrument sounds different to a guitar. The song is 
in the key of F#. If your knowledge of keys isn't particularly amazing, think of 
the key of G, one semi-tone down.

Key: F#maj

F#maj                                          BbmWalt (x13321@1)Grace, desperately hating his old place
EbmDreamed (xx4342@1)to discover a new space
                           BAnd (x2444x@1)buried himself alive
F#maj                                                                BbmInside (x13321@1)his basement, tongue on the side of his face meant
EbmHe's (xx4342@1)working away on displacement
                                       BAnd (x2444x@1)what it would take to survive

Ebm 
'Cause when you're done with this world
C#You (x43121@1)know the next is up to you
F#?                                    Ab?
And his wife told his kids he was crazy