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Celebreties often lip sink because they are either sick or injured(ex. Blew a vocal tube) or just unable to sing at the time bieng where as to other singers just cant sing at all because there songs were autotuned.

But if your talking about in public if someone is lip sinking its because they dont know the words

Also they might be dancing and there to tired to sing and out of breath or they cant multi-task

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12y ago

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