Playback singer
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A playback singer or ghost singer is a singer whose performance is pre-recorded for use in films. Playback singers record songs for soundtracks, and the performers lip-sync the songs for cameras; the actual singer does not appear on the screen.
Indian playback singer Lata Mangeshkar recorded thousands of songs
Pakistani playback singer Ahmed Rushdi performing live on stage in 1954
Lip sync
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Lip sync or lip synch, short for lip synchronization, is a technical term for matching a speaking or singing person's lip movements with sung or spoken vocals.
An audio engineer (foreground) recording a voice actor (at microphone) for an animated video production. Lip synchronization of this recording with animation will give the impression that an animated character is speaking.
Pop singer Ashlee Simpson (pictured in 2009) lip synced a song on the variety TV show Saturday Night Live in 2004.
Milli Vanilli in 1990
Spears performing in 2009's world tour The Circus Starring Britney Spears