I'll have a go for you although I'm probably wrong
Seems as though
B minor
B minor major 7 (or you could play a Bb aug
Bm7
Bm6
It's the vocals which are making the changes not the guitars it seems but best way to do it on guitar is play a B minor barre chord on 7th fret and then from the B note 9th fret run down one note each time, you'll hear it.
That was the theory but here are the shapes
It's in this order then just Em and A i think after played twice
7 7 7 x
7 7 7 7
7 7 7 7
9 8 7 6
9 9 9 x
7 7 7 7