Sur le pont d'Avignon, l'on y danse tous en rond.
What is l' doing here? When is it generally used like this?
I'm assuming it's a pronoun, but y already refers to pont, so it's not quite like je l'ai vu—or — or is it? I've seen it a lot in novels too. Perhaps this question is too basic; but I've asked a Frenchman andthis question but he couldn't tell me out of hand.