A few years ago, at a rather drunken wedding event in Hamburg, ( with military connections) my wife and I were the only English in a large hall of Germans (and few Danes). We had obviously not been noticed, as WW2 songs were sung freely by many Germans. During one speech by an older man, my Danish friends went very quiet, and refused to translate what was said, though we got the gist of it, which was unpleasantly Nazi and anti British in tone and which got much applause. We didn't stay long. So I would recommend avoiding ANY nationalist songs, of either country, at least until everyone is too drunk to notice.