On backmasking
Backtracking, or backmasking is the form of inserting hidden messages into tracks which can only be consciously heard when played backwards. Most of the time these messages are inserted purposefully, sometimes by accident, some people even believe that the subconscious can actually pick up these messages. But the nature of the backtracked messages in many modern pop songs is so sinister as to leave no doubt to the intentions and affiliations of these singers.
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THE ROLLING STONES: Tops
Forward: 'Or be sorry for the rest of your sweet loving life.'
Reverse: 'Yeah, I love you said the devil.'
Comments: The Rolling Stones are much more subtle. They use particular sound frequencies to arouse certain emotions in people. At one large American concert it is reported that during one experiment they aroused people to a violent mood which resulted in five murders that night.
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You may say that these songs are harmless because nobody listens to them backwards, but some psychiatrists agree that the subconscious mind can pick up these backward messages and if you listen to them enough, they become embedded in your subconscious mind