On the last Tour Keane played this Song on Guitar.They used a Capo on the 5th 
Please look at the chordlist below the tab. Here it goes:
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Update on 24.11.2010: I've changed the chords, now it must be right, big thanks to 
haluks for re-writing it:

Capo 5
Intro: C,Fmaj7
Verse 1
C               Fmaj7
An old fairytale told me
C                        Fmaj7
The simple heart will be prized again
C                  Fmaj7
A toad will be our king
    C               Fmaj7
And ugly ogres our heroes
              G
Then you'll shake
C                G
Your fist at the sky
C             G
"Oh why did I rely
    Dm7           G7
On fashions and small fry?"
Verse 2:
C             Fmaj7
All promises broken
C                   Fmaj7
Feed your people or lose your throne
    C                  Fmaj7
And forfeit your whole kingdom
C                       Fmaj7              G
I'd sooner lose it than still live in it alone
C                    G
You were our golden child
C                      G
But the gentle and the mild
C           Dm7     G7
Inherit the earth, while
Chorus:
C    Dm7      Am
Your prince's crown
Fmaj7             C
Cracks and falls down
      Dm    G           Fmaj7
Your castle hollow and cold
C          Dm7     Am
You've wandered so far
Fmaj7               C
From the person you are
Dm     G            Fmaj7
Let go brother, let go
     Fmaj7 G   Fmaj7
Cos now we all know
Bridge:
Am G  Em                 Fmaj7
Soon, someone will put a spell on you
Am  G     Em                Fmaj7             Dm
Perfume, treasure, sorcery, every trick they know
Em                   G
You will lie in a deep sleep
Fmaj7
That's when
Chorus:
C    Dm7      Am
Your prince's crown
Fmaj7             C
Cracks and falls down
     Dm     G          Fmaj7
Your castle hollow and cold
C          Dm7      Am
You've wandered so far
Fmaj7                C
From the person you are
Dm      G            Fmaj7
Let go brother, let go
     Fmaj7  G   C
Cos now we all know
Outro:C, Fmaj7 x2 C

C: 332010
Fmaj7: 033210
G: 32033
Am: 002210
Em: 022000
Dm: 000231
Dm7:000211
G7:320001
Please don't forget the Capo on 5th.