In Europe National Anthems are played before Football Cup finals.
I don’t bow to any monarch, because I am an American citizen.
I don’t bow to my mother because then she scolds me about my posture.
Regards,
Shodan
Well, American custom does recognise diplomatic protocol, which draws a distinction between heads of state and non-heads of state.
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Better yet, treat her as the British (or Canadian, or Australian…) Queen. Perennial nitpick: there hasn’t been a “Queen of England” since 1707: Anne, Queen of Great Britain - Wikipedia
Yes, but in that case Genghis or the little Khans were equally free to hang you up by your heels and have you flayed alive, stubborn freedom-loving American or not. 
Small data point. The annual Royal Variety concert was on a couple of nights ago. HRH Prince of Wales was in attendance. One of the performers was Lady Gaga. She curtsied, and quite deeply, during the introduction of performers at the end. Of course, she is a Lady, after all…
Back in 1981 Nancy Reagan got chided by the British press for not giving the Queen a curtsy. The papers were upset, but not so much Buckingham Palace.
As the above article mentions, the American press got upset when Mrs. Annenberg, American Chief of Protocol, curtsied to the Prince of Wales.
I don’t have to bow to her
But, she is the Queen after all, a head of state, so i would give her a bow.
It isn’t acknowledging she has position over me or anything, not doing it would feel kind of like a rude gesture when the lady has done nothing to me.
Now i would not kneel before her, because i am not subject to her and she has no station over me, but i really don’t expect she would even ask that.
I would probably try to follow any customary greeting as long as it was not offensive or degrading.
I wouldn’t like our representatives going someplace and being treat rudely
Before that there was Martha Mitchell, the colorful wife of Nixon Attorney-General John Mitchell. She was pretty brash about not bowing to Queen Elizabeth. Or curtsying. Whatever you do.
You are not supposed to kneel before a monarch anyway.
I believe Britain and Commonwealth countries played the national anthem at the cinema and it was good form to stand [knowledge based largely on an Alf Garnet film where he caused a right kerfuffle at the pictures].
Only for very formal ceremonies, such as taking a personal oath of allegiance at the Coronation or if you’re being appointed Prime Minister (there may be some other appointments where this happens - my degree ceremony at Cambridge involved something similar, a sort of hangover from monastic days, I think).
Or if you’re being knighted, but that’s a matter of practicality, since HMQ is much shorter than almost everyone she has to touch with a sword. She wouldn’t want to slice your ear off.
I suspect this came in during the First World War, and for a long time it was customary to start or end almost any public performance with the national anthem. In the cinema, it would be played at the end of the evening’s performance, which could lead to an unseemly steeplechase as people tried to find their way around staunch patriots standing to attention, in order to get to the pub before closing time or to catch the last bus. The habit finally died in the 1960s.
Oh, and there’s a campaign on in India at the moment to make people stand for the national anthem in cinemas, following a Supreme Court ruling:
https://www.youtube.com/watch?v=vX2AK5bVIxU
The national anthem in the cinema must have hung on a bit longer than that because I was born in 1968 and can remember it getting played.
In Canada, O Canada was still being played in theatres in Kingston Ontario in the 80s.
This pretty well sums up the situation in Norway with regards to royalty. I’ve met our king Harald a few years back, and this was pretty much the extent of it, as far as formal greetings were required
