Backmasking (also known as backward masking) is a recording technique in which a sound or message is recorded backward on to a track that is meant to be played forward. Backmasking is a deliberate process, whereas a message found through phonetic reversal may be unintentional.

Backmasking was popularized by The Beatles, who used backward vocals and instrumentation on their 1966 album Revolver. Artists have since used backmasking for artistic, comedic, and satiric effect, on both analog and digital recordings. The technique has also been used to censor words or phrases for "clean" releases of songs.

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Stairway to Heaven by Led Zeppelin

Original Audio: 

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Backmasked Audio: 

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