"There have also been recordings of unscriptural and even demonistic messages by means of a technique called backward masking, used by a number of musical groups. When the recording of one very popular song is played backward, it repeatedly says, “Decide to smoke marijuana.” (w83 10/15 pp. 10-15)
"In the early 1980s, "Another One Bites the Dust" was one of many popular rock songs that Christian evangelists alleged contained subliminal messages through a technique called backmasking. It was claimed that the chorus, when played in reverse, can be heard as "Decide to smoke marijuana", "It's fun to smoke marijuana", or "Start to smoke marijuana".A spokeswoman for Hollywood Records (Queen's current US label) has denied that the song contains such a message. (https://en.wikipedia.org/wiki/Another_One_Bites_the_Dust)