Em - 022000
Dsus2 - 000230
D - 000232
Dsus4 - 000233
G - 320033
G/F# - 200233

During the later Responses where you're just going back
 and forth between Dsus2 and D a bunch, for interest
you can switch up every other repetition into 
Dsus2-D-Dsus4-D, though I try to make sure the last one
 is
always a Dsus2-D again, just sounds best for 
transitioning into the call imo.
Any time you see G G/F# Em, that's just a walk down the
 top string with those chord shapes, I tend to just
hit the top two or three strings doing that but either 
way, only strike each chord once and heavy on the top.

[Intro]
Em  Dsus2 D  Em  G G/F# Em

[Call]
Em
Why do we build the wall?
Dsus2        D
My children, my children
Em                      G G/F# Em
Why do we build the wall?

[Response]
Em
Why do we build the wall?
   Dsus2             D
We build the wall to keep us free
       Em
That's why we build the wall
             G       G/F#    Em
We build the wall to keep us free

[Call]
Em
How does the wall keep us free?
Dsus2        D
My children, my children
Em                             G G/F# Em
How does the wall keep us free?

[Response]
Em
How does the wall keep us free?
    Dsus2              D
The wall keeps out the enemy
       Dsus2             D
And we build the wall to keep us free
       Em
That's why we build the wall
             G       G/F#    Em
We build the wall to keep us free

[Call]
Em
Who do we call the enemy?
Dsus2        D
My children, my children
Em                       G G/F# Em
Who do we call the enemy?

[Response]
Em
Who do we call the enemy?
    Dsus2              D
The enemy is poverty
        Dsus2              D
And the wall keeps out the enemy
       Dsus2             D
And we build the wall to keep us free
       Em
That's why we build the wall
             G       G/F#    Em
We build the wall to keep us free

[Call]
Em
Because we have, and they have not!
Dsus2        D
My children, my children
Em                                 G G/F# Em
Because they want what we have got!

[Response]
Em
Because we have and they have not
    Dsus2              D
Because they want what we have got
    Dsus2    D
The enemy is poverty
        Dsus2              D
And the wall keeps out the enemy
       Dsus2             D
And we build the wall to keep us free
       Em
That's why we build the wall
             G       G/F#    Em
We build the wall to keep us free

[Call]
Em
What do we have that they should want?
Dsus2        D
My children, my children
Em                                 G G/F# Em
What do we have that they should want?

[Final Response]
Em
What do we have that they should want?
    Dsus2              D
We have a wall to work upon!
Dsus2            D
We have work and they have none
Em
And our work is never done!
Dsus2        D
My children! My children!
Em
And the war is never won!
    Dsus2    D
The enemy is poverty
        Dsus2              D
And the wall keeps out the enemy
       Dsus2             D
And we build the wall to keep us free
       Em
That's why we build the wall
             G       G/F#    Em
We build the wall to keep us free
N.C          G       G/F#    Em
We build the wall to keep us free