davywavy | Name that tune

I've been engaging with too much victoriana and booze. It's doing something to my brain.

What-ho, attractive singletons throughout the empire
There are peculiar events afoot.
Inform your mater, your pater and your chaperone
Things are about to commence and you are aware of your duty.

Raise your hands in your air like a member of the lower classes
And ignore the social outrage at your actions.
Step and turn
Step and turn
Turn a speedy gavotte with your mother and inform me as to the latest addition to the lexicon.
Addition.
All assembled speak when the alarum is heard
In order to begun, give the countersign.
Don't worry about timings, we're listening.

Now those foolish maitre d's
Who believe themselves to have made a splash
Presumably there is a cause
And they believe they will be informed as to why.

They adopt the manners of their social superiors
But in so doing they appear as nothing more than the intellectually subnormal
The introduction of melody inspires us to cavort
And my fobwatch informs me that psychological romance is quite out of the question.
No, I'm afraid that's final.
Final, I say, sir!
So, what is the latest addition to the lexicon, my dear?
The lexicon?
Speak up, have you heard the telegraph?
As then we shall commence.

Word up.