Welcome to Wikipedia's portal for music. Music consists of sound heard over time. It is predominantly used to evoke emotion or thought in the listener. Music is often described as an art form that involves organized sounds and silence. It is considered by some cultures to be a language in and of itself. Music is also used as an accompaniment to dance and a means to communicate with spirits. Within the arts, music can be classified as a performing art, a fine art, and an auditory art form though the definitions of music vary according to culture and social context.
Backmasking (not to be confused with 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 popularised by the Beatles who used backward instrumentation on their 1966 album Revolver. Artists have since used backmasking for artistic, comedic and satiric effect, on both analogue and digital recordings. The technique has also been used to censor words or phrases for "clean" releases of rap songs.
Backmasking has been a controversial topic in the United States since the 1980s, when allegations from Christian groups of its use for Satanic purposes were made against prominent rock musicians, leading to record-burning protests and proposed anti-backmasking legislation by state and federal governments.