Kissanpolkka, Flohwalzer...

This Wikipedia article on Flohwalzer is amazing in many ways but, but Sweden, what on Earth?

Swedish songwriter Thore Skogman used the piece as the basis for his 1962 song “Kalle Johansson [sv]” (which has since become the Swedish name for the melody in general), featuring lyrics about a man named Kalle Johansson, who gets in a love affair that involves him, his sister, and two of their neighbors.