I have recently taken part in a ceremony to admit some 30 or so people to British citizenship. My role was to help lead in the singing of the National Anthem after they’d heard from one or two people from the local council (they managed to work in their slogan ‘Making Bath & North East Somerset an even better place to live, work and visit’!)
Some mood-setting music was played beforehand and along with the expected Elgar, Vaughan Williams etc. there was Zadok the Priest by Handel. Actually, this was the most appropriate piece for the occasion, because Handel was himself naturalised, though in those days it had to be done by Act of Parliament.