Tandernaken
Tandernaken, al op den Rijn (also spelled: T'Andernaken, al op den Rijn) was once a very popular Middle Dutch song about two girls who in Andernach, a city in Germany on the left Rhine bank, were spied on by the lover of one of the girls, who was listening to their conversation on love affairs from a distance.
Read more about Tandernaken: Middle Dutch Text, History