Of course "I vow to thee, my country, all earthly things above" would be a fair old national anthem for any country.

But then, why shouldn't different countries have the same national anthem? When it comes to tunes of course they do, more especially the one for God Save the Queen. (For example, when England played Liechtenstein they had to play it twice.   You'd think they'd use a different key, but no - according to my book of National Anthems it's always in G.)

Actually it's not a bad tune, it's just that it's always played so ponderously. I remember hearing it on Steel Drums one Notting Hill Carnival, and it sounded pretty good.