This is for me a very poignant rendition of the American national anthem .
On the day after 9/11 Queen Elizabeth ordered its playing at the Changing of the Guard at Buckingham Palace .
The two men standing inside the palace gates are the Queen's second son , Prince Andrew , and the American Ambassador to the UK .
This is the Battle Hymn of the Republic sung by a congregation of thousands , inside and outside , at Saint Paul's Cathedral for the Memorial Service in London on September 14th 2001 for the victims of the 9/11 terrorist attacks on the United States.