This song is somewhat fitting for Louis, I think. It's basically about everything that he blames himself for. Claudia being the way that she is and for the "killing" of Lestat.
WHAT I'VE DONE: LINKIN PARK
In this farewell
There's no blood
There's no alibi
'Cause I've drawn regret
From the truth
Of a thousand lies
[Pre-Chorus:]
So let mercy come
And wash away
What I've done
[Chorus:]
I'll face myself
To cross out what I've become
Erase myself
And let go of what I've done
Put to rest
What you thought of me
While I clean this slate
With the hands of uncertainty
[Pre-Chorus]
[Chorus]
For what I've done
I start again
And whatever pain may come
Today this ends
I'm forgiving what I've done
[Chorus]
What I've done
Forgiving what I've done
music: What I've Done, Linkin Park
movie: Interview with the Vampire