From the sixties to the nineties parents worried messages hidden in rock albums would make their children do drugs and worship the devil. The truth could only be revealed if these records were played backwards. Bryan Gardiner unveils the history behind the backmasking panic and Curiosity Daily’s Ashley Hamer explains why our brains hear hidden messages... even when they’re not there!

Twenty Thousand Hertz is produced out of the studios of Defacto Sound, and hosted by Dallas Taylor. Follow the show on Twitter, Facebook, & Reddit.Become a monthly contributor at 20k.org/donate. If you know what this week's mystery sound is, tell us at mystery.20k.org. Check out Curiosity Daily Podcast wherever you get your podcasts.Episode transcript, music, and credits can be found here: https://www.20k.org/episodes/satanicpanicLearn more about your ad choices. Visit megaphone.fm/adchoices