There is a rather neat little anecdote involving 'O Little Town of Bethlehem.'

When Winston Churchill conferred with FDR in the dark days of either late 1940 or 1941 (at sea, I believe aboard the battleship Prince of Wales), there was a church service on deck. Churchill in his memoirs -- I don't remember which of the six books it was in, but it would not be hard to find -- he remarked how they played this carol he had never heard before and liked very much.