Progresion de Acordes

Hola quisiera saber que funcion cumple cada acorde en la cancion "exit music (for a film)" de radiohead

la canción basicamente es la siguiente:

bm f#
wake, from your sleep,
d e
the drying of your tears,
bm f# bsus4 b
today we escape, we escape.

bm f#
pack, and get dressed,
d e
before your father hears us,
bm f# bsus4 b
before, all hell breaks loose.

am e
breathe, keep breathing,
bm f#
don't lose, your nerve
am e
breathe, keep breathing,
bm f# bm
i can't do this, alone.

bm f#
sing, us a song,
d e
a song to keep us warm,
bm f#
there's sucha chill sucha chill,


e bm b bm


bm c#
you can laugh
f# g
a spineless laugh
c f#
we hope that your rules and wisdom choke you
bm f#
now we are one
d e
in everlasting peace

bm f# b bm b
we hope that you choke, that you choke,
bm f# b bm b
we hope that you choke, that you choke,
bm f# b bm b
we hope that you choke, that you choke.

que raro, no me deja poner en mayuscula los nombres de los acordes.

esa no es la canción que dices, me parece