Then there's "The Worm Song" from the 1960s. Don't know who wrote it. Seems to have gone away. It's fun to do with a pair of sock puppets on your hands. Male and female worms. Yes I know that's not possible biologically speaking. It does have a tune but it's pretty basic and I don't have a midi of it.

The Worm Song

The earth it was damp with the dew of the dawn
And fresh scented air spread over the lawn
When a handsome young worm crept up from the ground
Gazing up from his hole he gazed all around

Just then as he stared at the sun in the sky
Another little worm popped up quite nearby
Said the first with a squiggle, "you're a trim little worm
Why not wiggle out here and we'll go for a squirm.

If you'd only agree to a brief rendezvous
I would love to surrender my heart just for you.
I'd build you a home and treat you with care
And happy we'd be as the birds in the air."

But the trim little worm gave a shake of its head
As she sadly replied, "I would love to be wed
But I fear we can't marry, though I know you'd be true
For you see Mr Worm -- I'm the other end of you!"