According to "The Making of the Super Bowl: The Inside Story of the World's Greatest Sporting Event" by former league executive director Don Weiss, the NFL has required performers to have a backup track since 1993, when country crooner Garth Brooks threatened to leave the stadium minutes before he was scheduled to perform unless NBC played his new video. Brooks had previously refused to prerecord the anthem, which meant the league had nothing to play in his place if he left.
I thought Jennifer did a great job on the national anthem, lip-sync'd or not. I don't really have an issue if an artist lip sync's to their own voice.


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