I attended a few seminars on the dangers of Rock and Roll music in the late 70’s or early 80’s. At least one of the seminars included playing some of the songs backwards, a technique known as backward masking. When the song was played backwards, there were barely intelligible words that spoke a different message. I remember trying to spin different songs backwards on the turntable to hear what it sounded like backwards. It was a little odd. The idea was that subliminally, you would be hearing things that were unintelligible to the ear but it would affect you both positively and negatively.