Paul McCartney said you can hear a vulgar message if you play one of the songs from The Beatles’ Sgt. Pepper’s Lonely Hearts Club Band backward. However, he indicated this was not The Beatles’ intent. Here’s what happened when Paul played one of The Beatles’ most famous songs backward –and why he decided to do so in the first place.
During a 1974 interview with Rolling Stone, Paul discussed how fans found many hidden meanings in The Beatles’ work. For example, he mentioned some people believed the cover of Abbey Road contained clues revealing he died. He said it was easy to see hidden meanings in things if you were looking for hidden meanings.
Then he discussed backmasking. Backmasking is the phenomenon in which artists will put backward messages in their songs. While there are some examples of intentional backmasking, other times fans hear messages in songs played backward the artist did not intentionally put there. For example, Paul admitted that one of the songs from Sgt. Pepper sounded like it included a vulgar lyric when played backward even though he wasn’t aware of this until after the album’s completion.
Source: cheatsheet.com