So it's basically D for the intro with a couple of changes here and there which I'll let 
you figure out. The it goes:
   Bm                       G
so go ahead and lie to yourself,
                           A
and pretend that you?re a ray of light,
                A
when you?re a broken candle,

Bm                             G
  you?re keeping time with yourself,
                              A
when did it all start moving way too fast,
    A
for you to handle,

        Bm                   G
you?re short on breath but heavy on time,
     A                        Bm      A
you lost the words but you found the rhyme,
      G               A
it?s all just poetry now,


the walls are singing,
Bm    G       A
hallelujah amen,

the walls are singing,
Bm   G       A
hallelujah amen,

*piano*
Bm G A
Bm G A


Bm                   G
it?s so dark in the room,
                       A
and the ceilings are high,

you know the feeling,
                      Bm
you?ve been here before,

Bm                      G
But it?s a broken old pew,
                     A
and it?s an echoing cry,
                      Bm
don?t sell yourself short,
                 G
on breath and heavy on time,
     A                       Bm        A
you lost the words but you found the rhyme,
      G               A
it?s all just poetry now,


the walls are singing,
Bm    G      A
hallelujah amen,

the walls are singing,
Bm    G      A
hallelujah amen,
x2

Now's the part where it gets all intense and in the latest version Sam does his speech. 
Basically the chords are

Bm G A

or something along those lines.

    Bm          G
in time you?ll find,
               A                       A
this life?s a painting and you?re the artist,
    Bm        G
so open your eyes,
                A                  A
it?s never too late to clear your canvas,

     Bm
so paint me jealous,
G
paint me rage,
     A                  Bm    A
for God?s sake paint me anything,
      G
just paint,
              A
your brush awaits,

Bm   G        A
hallelujah amen,

the walls sing you to sleep,
Bm   G        A
hallelujah amen,
                    Bm        G       A
one secret meant to keep you safe tonight,
                   Bm        G       A
I swear that everything will be alright


and then the last note is the 5th fret of the bottom string