I remember seeing it a long time ago. The character played by Charlotte Rampling is extremely unpleasant.
But at least the movie explains the song, which was very popular when I was in middle school.
That’s too bad. Rampling was one of those many babes of the 60’s that were turning up in a ton of TV shows. She’s great as a pistolera in one of my favorite episodes of the Diana Rigg Era of The Avengers.