Ok...just because I just listened to it...

"Brand New Day"
From: Dr. Horrible's Singalong Blog

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This appeared as a moral dilemma
Cause at first it was weird though I swore to eliminate
The worst of the plague that devoured humanity
It's true I was vague on the how
So how can it be that you
Have shown me the light?

It's a brand new day
And the sun is high
All the birds are singing
That you're gonna die
How I hesitated
Now I wonder why
It's a brand new day

All the times that you beat me unconscious
I forgive, all the crimes incomplete, listen honestly
I'll live Mr. Cool, Mr. Right, Mr. Know-it-all is through
Now the future's so bright and I owe it all to you
Who showed me the light

It's a brand new me
I've got no remorse
Now the water's rising
But I know the course
I'm gonna shock the world
Gonna show Bad Horse
It's a brand new day

And Penny will see the evil me
Not a joke, not a dork, not a failure
And she may cry but her tears will dry
When I hand her the keys to a shiny new Australia

It's a brand new day
Yeah the sun is high
All the angels sing
Because you're gonna die
Go ahead and laugh
Yeah, I'm a funny guy
Tell everyone goodbye
It's a brand new day...