Backmasking is a method of recording a sound or section of music backwards with the intention of having the part played forwards. Backmasking requires intention on the part of the recorder. Hearing a backward message where none is intended is an example of pareidolia.
Accusations of backmasking have created numerous controversies. It was believed that some bands implanted hidden satanic messages in their music, although in most cases evidence is only anecdotal or the result of pareidolia. The most famous example of mistaken accusations of backmasking is the "Paul is dead" urban legend, in which The Beatles were accused of planting hidden messages in their songs, such as "Turn me on, dead man" and "Paul is dead", to reveal that their lead singer Paul McCartney had died and that they were covering it up.