Well, I have to do this… Hopefully no one else has had the idea yet ;)

added later - BTW, thanks to everyone who reviewed so far. Green Sea Turtle wins a chocolate frog for being the first person to notice that I missed Ginny out. Please forgive me. I was so preoccupied with how awesome Luna is :) (She's my new second favourite character. Dumbledore is still first. Oh how I love that man...) Lina, I can see what you mean about Harry being a jerk, though he is under a lot of pressure so we can forgive him some things. And he's not as arrogant as his dad was at his age :)

To the tune of 'Oliver's Army' by Elvis Costello.

Dumbledore's Army

Down in the Hog's Head
A group of kids will meet tonight
Voldemort's who they dread
So they'll try to put the world to right
Getting Dark Arts information
Rather dangerous occupation

Dumbledore's Army is here to stay
Dumbledore's Army are on their way
And Umbridge can't catch up with them
They're safe today

They were all led by Harry
They would meet every week
They knew they couldn't tarry
Marietta betrayed them, what a sneak!
Though Albus took the blame
They can continue all the same

Dumbledore's Army is here to stay
Dumbledore's Army are on their way
And Umbridge can't try to disband them
They're safe today

Harry's having strange dreams
Things are not what they seem
Now they're on a rescue mission
But it's a foolish expedition
With Hermione, Luna, Ron and Neville too... (yelled by angry Ginny fans) And Ginny too!

Don't listen to Kreacher
He's a very bad House Elf
Though he says Padfoot's out
Sirius is not in danger just yet
It's just a trap to lure them all in
But now the second war will begin

Dumbledore's Army is here to stay
Dumbledore's Army are on their way
They may be young but they'll fight on
In every way…