Did you know that the melody of German Christmas carol O Tannenbaum is also used for the official state songs of Iowa and Maryland? And that the Britisch Labour Party used it for their hymn The Red Flag? And that waaaay back in 1990, three Dutch guys called De Ideale Schoonzonen (the ideal sons-in-law) mashed it up with Simple Minds' millionseller Don't You Forget About Me?
Now you do. (Thanks Luba)
De Ideale Schoonzonen - Oh!! Denneboom