Two jigs!

The Hundred Pipers
Chorus:
Wi' a hundred pipers, an' a', an' a',
Wi' a hundred pipers, an' a', an' a',
We'll up an' gie them a blaw, a blaw
Wi' a hundred pipers, an' a', an' a'.

Full Scots words on Wikipedia

Cock o’the North
A 6/8 military march, bagpipes tune and jig. The original version is evidently English. The earliest mention of a piece of music called "Joan's Placket is Torn" was in Samuel Pepys’ diary for June, 1667. It was also known at the same period as "Jumping John/Joan". There is a Scottish children's rhyme which should be interesting in sign language;

Auntie Mary had a canary Up the leg of her drawers
When she farted it departed To a round of applause

Auntie Mary had a canary Up the leg of her drawers
She pulled a string to make it sing And down came Santa Claus

If that is too risque, you could use another rhyme, say;

Auntie Mary had a canary In an old chest of drawers
And when she coughed it flew aloft To a round of applause

Auntie Mary had a canary In an old chest of drawers
She pulled a string to make it sing And out popped Santa Claus