My mother, who was pretty posh, (My friends called her The Duchess.) taught me "Three Old Ladies Got Locked in a Lavatory", and a couple of similar classics.

One of the girls in my school was the daughter of an opera singer. The lady would inflict herself on us once a year in a special assembly that, generally ran through recess. She sang folk songs, but they sounded like opera, with high notes, trills and all the rest. It was hard to understand her, and generally not so great.