Two especially unusual performances took place in the immediate aftermath of the September 11 attacks in the United States . On September 12 , 2001 , Queen Elizabeth II broke with tradition and allowed the Coldstream Guards Band to perform The Star-Spangled Banner at Buckingham Palace , London , during the daily ceremonial Changing of the Guard . The following day at a St. Paul 's Cathedral memorial service , the Queen herself joined in the singing of the American national anthem , an unprecedented occurrence
September 11 attacks
September 11 attacks
Band of the Coldstream Guards