I'm not sure what the third Chord is exactly. I play an Am without the A base. So 
it looks like this
E--0----
B--1----
G--2----
D--2----
A--x----
E--x----

If you are strumming, a normal Am sounds finds, however, if you want to accent the 
base not, don't hit the A string, hit the D string. All other chords are played normally.

           D5    C5
Behind the sweet
       A5
Summer fade
         D5
And on a coast
    C5     A5
Not Far away
             D5    C5
Sometimes we glide
             A5
Sometimes we fall
              D5
And there are times
             C5     A5
We don't get up at all

              D5    C5
You had your doubts
           A5
We had our rows
          D5
Said our goodbyes but
          C5      A5
Now we're taking vows

           D5   C5
Behind the sweet
       A5
Summer fade
                D5
You'll knock me down
       C5     A5
Like a tidal wave

            D5   C5
I should be gone
       A5
Cast away
              D5
But still I'd love you
        C5             A5
Through all peace and hate

            D5  C5
In light of all
        A5
Darkest things
           D5
The fire glimmers
         C5        A5
And the darkness sings

(I think you get the idea)

If you should go
I won't have you to blame
For my unhappiness for darker days
When will I learn
It's not your fault
Breaking down could not
Be cured by breaking up
Cause breaking down could not
Be cured by breaking up

I should be gone
Cast away
But still I'd love you
Through all peace and hate

In light of all
Darkest things
The fire glimmers
And the darkness sings

Forever more
Peace and hate
Love and war
Declare a new state

Forever more
Peace and hate
Love and war
Declare a new state

Yell and shout and kick me out
Then forget what we fought about
But don't give up
These storms are passing

Yell and shout and kick me out
Then forget what we fought about
But don't give up
This storm is passing