They wrote the words they wanted to write. Without the suggestion you aren't hearing actual words. They could have written anything and as long as it's read or spoken along with it it's going to make it seem right. This, I believe was used to demonstrate the evils of rock and roll by a religeous organization. It wouldn't have they same effect as if they were worshipping the Great Pumpkin. The power of suggestion is used to sell the illusion. Repeat man made climate change enough and see what happens. Oh.... wait....
An interesting demonstration
The woman whose name is Poppy does a mind bending demonstration of how suggestion can dictate what we hear.
https://www.youtube.com/watch?v=BYTlN6wjcvQ
https://www.youtube.com/watch?v=BYTlN6wjcvQ