Qual é a melodia da música do Joker em The Killing Joke?

Quando Joker está falando com Gordon pelo interfone em Batman: The Killing Joke , o esquema de enunciação e rimas (e o fato de ele pedir música) tornam bem óbvio que o Coringa está cantando . Existe uma fonte oficial sobre como a música deveria ser cantada? Melodia, tempo, altura, etc?

Letras:

When the world is full of care
And every headline screams despair,
All is rape, starvation, war and life is vile

Then there’s a certain thing I do
Which I shall pass along to you,
That’s always guaranteed to make me smile:

I go loo-oo-oony as a light-bulb battered bug!
Simply loo-oo-oony, sometimes foam and chew the rug!

Mister, life is swell
In a padded cell,
It’ll chase those blues away:
You can trade your gloom
For a rubber room
And injections twice a day!

Just go loo-oo-oony like an acid casualty,
Or a moo-oo-oonie, or a preacher on T.V.

When the human race
Wears an anxious face,
When the bomb hangs overhead,
When your kid turns blue,
It won’t worry you,
You can smile and nod instead.

When you’re loo-oo-oony, then you just don’t give a fig,
Man’s so pu-uu-uny, and the universe so big!

If you hurt inside,
Get certified,
And if life should treat you bad...

Don't get ee-ee-even.
Get mad.
- Batman: The Killing Joke, Alan Moore and Brian Bolland