An interesting side note.
When I was in Poland in 1980 (under Communist rule) they sang the "Polish National Anthem" (Communist version) for us. They proudly announced that this tune had been written by a 12 year old comrad for the stiring words they were singing. I started to argue with them because the tune was very familiar to me. It was not until I got back and poked around that I realized it was the tune to "Father, May I go out dancing/Yes, My darling daughter..."