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You can play the A as Asus4, he does this sometimes in the demo and that's what the organ is playing. 
Likewise you can play the Em as an Em7, basically if you fret the high D in every chord it sounds
~unresolved~ and ~deep~ like the album version. Either way, let's burn it all down together.

Asus4:  x02230
Bmsus4: x24430
Em7:    022030

(intro to the demo version: D A Bmsus4 A D)

D                            G       D
Look in the cellar where the cinders blaze
G                D           A
Sift through the shadows for days
D                            G        D
Look in the corners, but you can't see me
G             A      D
You can't see me I'm free

D                       G    D      G    D    A
I'm gonna burn it all down today, down today, okay
D                      G    D    
I'm gonna burn it all down today
A                       D
And sweep all the ashes away

Count up the keepsakes in the cabinets
The keyboards and the chemistry sets
Look in the attic where the blinds are drawn
A                     D
You won't find me I'm gone

I'm gonna burn it all down today, down today, okay
I'm gonna burn it all down today
And sweep all the ashes away

        Em
Etch an outline on your heart
          G                      A
I'm gonna blow the whole circus apart

Reckon the remnants when they land at last
The shattered aftermath of the blast
Look for me everywhere the burn marks form
Trying to find a place to keep warm

I'm gonna burn it all down today, down today, okay
I'm gonna burn it all down today
And sweep all the ashes away

I'm gonna burn it all down today, down today, okay
I'm gonna burn it all down today
And sweep all the ashes away

I'm gonna burn it all down today, down today, okay
I'm gonna burn it all down today
And sweep all the ashes away