I heard Bears den play this song at the O2 arena when they were supporting Mumford and Sons. 
I loved this song when they played and so got it and worked out the chords, they are done by ear 
but I am sure they are right! You can download this song free here at their official website. - 
http://www.musicglue.com/bearsdenmusic/ 

Capo:4
Standard tuning: EADGBE

Enjoy :)
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Bears den: Pompeii

C
We built our home out on the slopes,
Am
Pompeii beneath she lay above,
G
How she haunted our home,
F
How she haunted our home.

C
You were a God in my eyes,
Am
Above the clouds above the skies,
G
You were a God in my eyes,
F
You were a God.

C
You took me walking through the town
Am
Showed me the statues underground,
G
Said, "just don't they look at peace,"
F
Sometimes I wish that was me.

C
I was the son you always had,
Am
Tugging at your coat while you were sad,
G
I was the son you always had,
F
I was the son you always had.

Chorus
C
Just don't cry,
Am
Hold your head up high,
G
She would want you to,
F
She would want you to.

C
Please just don't cry,
Am
Hold your head up high,
G
She would want you to, 
F
She would want you to.

This chord pattern continues for the rest of the song

You said stay in the car and wait,
There's just some things I have to say,
Don't you know I miss her too,
I miss her just as much as you.

So my father and my son,
As you end what you've begun,
You'll lie patient by her side,
With roses red and lilies white.

I was too young to understand,
The flowers slipping from your hand,
I was too young to understand,
I was too young to understand.

I was too young to understand,
The flowers sleeping in your hand,
I was too young to understand,
I was too young to understand.

Oh please just don't cry, 
Hold your head up high,
She would want you to,
She would want you to.

And just don't cry,
Hold your head up high,
She would want you to,
She would want you to.

:)