This might sound harsh. But America has a pretty piss-poor concept of how valuable and respectable our anthems our and other countries, like Canada and most of the EU, have very specific rules and practices out of respect for other countries anthems and their own. In most countries it is illegal to ad-lib the national anthem or detour from the original key, melody, and wording of it. When people in the United States, for example, sing the national anthem they overly hold out long notes, the gliss throughout long phrases, they change the key it was written in and the style. If you were to do that in most other 1st and 2nd world countries you COULD be arrested and fined for defacing the national anthem. A lot of countries, out of respect, sing the anthem for both participating teams because the kids there are taught to do it out of respect. Even if they don't know the words they give ooohs and aaahs out of courtesy. Being an American I sometimes get disturbed at the way people sing our own anthem, and funny enough, when Francis Scott Key wrote it he never assumed it would have been defaced like it commonly is today. Is it a big deal, not really because it is the way we do things here. I do think it is disrespectful to do it the way many famed singers do it here, but alas, I don't loose sleep over it or bitch about it.
Gotta love the way Canada made a great example of respect. b^^
Also, during the Olympics you won't see it very often because of how often you'd have to do it. XD So don't use that as an example.