http://www.vh1.com/news/52612/15-songs-satanic-backwards-messages/
http://mentalfloss.com/article/57351/15-famous-songs-misunderstood-meanings
https://en.wikipedia.org/wiki/Imagine_(John_Lennon_song)
http://ultimateclassicrock.com/judas-priest-suicide/
http://www.bbc.com/culture/story/20141003-the-hidden-messages-in-songs
https://en.wikipedia.org/wiki/Stairway_to_Heaven
http://www.subliminal-video.com/britney-spears-hit-me-baby-one-more-time-subliminal-messages/
http://www.subliminal-video.com/pantera-reversed-to-reveal-subliminal-messages/