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:
   B5                       G5
so go ahead and lie to yourself,
                           A5
and pretend that you?re a ray of light,
                A5
when you?re a broken candle,

B5                             G5
  you?re keeping time with yourself,
                              A5
when did it all start moving way too fast,
    A5
for you to handle,

        B5                   G5
you?re short on breath but heavy on time,
     A5                        B5      A5
you lost the words but you found the rhyme,
      G5               A5
it?s all just poetry now,


the walls are singing,
B5    G5       A5
hallelujah amen,

the walls are singing,
B5   G5       A5
hallelujah amen,

*piano*
B5 G5 A5
B5 G5 A5


B5                   G5
it?s so dark in the room ,
                       A5
and the ceilings are high,

you know the feeling,
                      B5
you?ve been here before,

B5                      G5
But it?s a broken old pew,
                     A5
and it?s an echoing cry,
                      B5
don?t sell yourself short,
                 G5
on breath and heavy on time,
     A5                       B5        A5
you lost the words but you found the rhyme,
      G5               A5
it?s all just poetry now,


the walls are singing,
B5    G5      A5
hallelujah amen,

the walls are singing,
B5    G5      A5
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

B5 G5 A5

or something along those lines.

    B5          G5
in time you?ll find,
               A5                       A5
this life?s a painting and you?re the artist,
    B5        G5
so open your eyes,
                A5                  A5
it?s never too late to clear your canvas,

     B5
so paint me jealous,
G5
paint me rage,
     A5                  B5    A5
for God?s sake paint me anything,
      G5
just paint,
              A5
your brush awaits,

B5   G5        A5
hallelujah amen,

the walls sing you to sleep,
B5   G5        A5
hallelujah amen,
                    B5        G5       A5
one secret meant to keep you safe tonight,
                   B5        G5       A5
I swear that everything will be alright


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