video transcript

PLEASE NOTE: EDIT CONTAIN CONVERTED 4:3 MATERIAL. As Beyonce sits in the middle of a lip-sync storm. Let's not forget she is not the first singer to have been accused of singing to a pre-recorded track. The Grammy-winning singer remained silent on Wednesday (January 23) amid reports about whether she was lip-synching or performing live when she delivered a flawless version of "The Star-Spangled Banner" to hundreds of thousands of people in Washington and millions watching on television. New York based vocal coach, Liz Caplan, who is currently coaching the casts of Tony Award winning musicals "Once" and "The Book of Mormon," said singing to a pre-recorded track is very common. SOUNDBITE Voice coach Liz Caplan saying (English): "Nearly everybody through, at least recent recording history has had to do that. Because sound in stadiums and sound at the Washington Mall is not going to be perfect. It's not a perfect world because you can't really control the sound as much as you can in a recording studio or in a theater or at somebody's gig." That long history of others well-known artist thought to enlist the aid of pre-recorded music include Madonna at her 2012 Super Bowl half-time performance last year, as did the late Whitney Houston in 1991 and Beyonce in 2004 during their respective renditions of the national anthem. Beyonce is due to take the spotlight again next month - this time during the February 3rd Super Bowl half-time show.