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Intentional backward masking: A verbal message is recorded, is reversed in direction, and is superimposed on an existing musical passage. This can only be done intentionally -- by design.
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Unintentional Backward Masking: All lyrics, when played backwards, sound like gibberish. They vaguely sound like words in a foreign language. However, with a bit of imagination, one can sometimes make out sounds that resemble English words.