This fascinating 5 part setting of the Dutch popular tune T’Andernaken was originally in four parts. The fifth part was added later.
Alamire was a mysterious figure who, among things, was a spy, and a double agent to boot.
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.
(more ℅ Wikipedia↣)