Have just been reading through this thread again, and spotted a reference to a song about Per Spelman. The song began,
"Per Spelman was lucky and had a fine cow.
He wanted to fiddle but didn't know how..."
He ends up selling his cow for "a violin, a violin, a viiiiooooliiin."
But my naughty class used to sing "He wanted to piddle and didn't know how..." Nothing I did or threatened could stop them, probably because I was trying to smother my own giggles every time.