I've always liked national anthems.
The greatest, of course, has to be La Marsellaise. I always feel that judging national anthems is like judging a baby competition; it's kind of horrible to say that one child is more beautiful than another, as it to say one country's anthem is lesser than another's. But the French still have the best one.
If I had to name some of my favourites, they would be as follows - though in no particular order (my own - the Irish - excepted for this purpose, given the thread title!)
5. The U.S.A
When I was about 11 (back in 1981), I spent about three months in Kuwait; it was where my interest in aviation began. I have very happy memories of my time there. Every day, the national television station would start with the national anthem. It's never going to be regarded as one of the world's greatest; it may not be great from a technical musical standpoint (I am certainly no one to judge), but it's an expression of love for their country by their people - which is really what it's all about - and I think it's rather nice:https://www.youtube.com/watch?v=96bOcrc-AZs