Garth Brooks reportedly nearly walked out on performing the national anthem at the Super Bowl in 1993 — and re-defined the rules for Super Bowl performers in the process. Brooks is not the only country star to have been picked to sing the anthem — Charley Pride, Faith Hill, the Dixie Chicks, Kelly Clarkson and Carrie Underwood have all done the honors over the years. But his reported last-minute boycott of the show resulted in a policy change that has become a part of the institution. According to former NFL Executive Director Don Weiss’ book, The Making of the Super Bowl: The Inside Story of …