I recall the transition from singing God Save the Queen to Oh Canada very well. Some of you may find my little relevant and personal tale interesting.  Mixed marriages were a rarity then, so in 1969, when the Catholic French Canadian side of  my family was about to come to our synagogue in Montreal for my Bar Mitzvah, I  suddenly recoiled in horror when I realized that the ceremony would open with God Save the Queen rather than "Oh Canada".   I begged the administration to  allow us to sing "Oh  Canada" instead.   As it was "my day" the synagogue relented and for the first time in synagogue history, the Congregation sang what was to become our National Anthem.  Never had so many Catholics been made so happy in a Jewish synagogue.