This one hit me on the drive from DC to New York, and I realized I had to do it before someone beat me to it. Nothing like being stuck in a car to force you to rhyme...

Spoilers for Harry Potter And The Deathly Hallows.

"Fugue For Hallows"
by scifantasy
ttto: "Fugue For Tinhorns" by Frank Loesser

[Antioch:]
I got the Wand right here,
You better run in fear,
'Cause I can turn you into a greasy smear.
This Wand! This Wand!
This Wand and I have a bond.
If I die it will move on.
This Wand! This Wand!

[Cadmus:]
I have a magic rock,
This may be quite a shock,
But I can turn back time on the Deathly clock!
The Stone! The Stone!
I can bring back flesh and bone.
Without you I'm so alone.
The Stone! The Stone!

[Ignotus:]
This Cloak is really slick,
I swear it's not a trick!
If I put it on I disappear quick!
This Cloak! This Cloak!
I vanish like clouds of smoke!
This isn't some kind of joke,
This Cloak! This Cloak!

[Grindlewald:]
I have the Wand at last!
I grabbed it and ran fast,
Just look at all the spells it can let me cast!
It's great! It's great!
Allow me to demonstrate.
The power to alter fate!
It's great! So great!

[Gaunt:]
This Stone belongs to me,
It's in my family!
And it's a sign of my bloodline's purity!
All mine! All mine!
This ring and its Stone are mine!
It bears my family sign!
All mine! All mine!

[James:]
This Cloak is really keen!
I can walk 'round unseen!
So I can pull a prank and then vanish clean!
So neat! So neat!
This silvery Cloak is sweet!
Its magic just can't be beat!
So neat! So neat!

[Voldemort:]
This Wand is magical,
Just feel its special pull,
And I am pleased that it is so powerful.
Won't work! Won't work!
This Wand's driving me berserk,
I can't understand this quirk.
Won't work! Won't work!

[Dumbledore:]
The Stone will not work right,
And out of evil spite,
I'm dying from the curse which was laid on tight.
Dead man, dead man.
Will Harry complete my plan?

[Harry:]
This Cloak belonged to Dad,
He died and it's so sad,
But now Voldemort's made me fighting mad!

[V:] Elder Wand!
[D:] Resurrection Stone!
[H:] Invisibility Cloak!

[All:] We've got the Hallows here!

(And yes, when I get back to DC and my computer, I'll consider recording it.)