I just saw the second video here for the first time, and it reminded me of the first one. But the effect is better if you come to them the other way round. (Work with me here....)
So: here are Kit and the Widow, a comedy musical duo in the same mould as Flanders and Swann or Tom Lehrer, doing probably their most famous number, Norwegians.
Now we take you, not to the London Underground, but the Copenhagen Metro. Where we encounter, not hundreds of Norwegians but dozens of Danes playing the music of one Norwegian.