At the risk of repeating myself: The English language is evolving all the time. We can be unhappy about this or we can be happy about it BUT we can do very little about it as individuals so we might as well learn to accept it. A sensible way forward for all of us here is to accept the wider usage and meanings of both words and come to an understanding among ourselves about what we mean by them when we discuss them on forums like this one.

Of course 'Happy Birthday' is traditional in almost every sense. It doesn't alter (apart from in the very humorous way mentioned above)simply because it is very brief, easily remembered and is in constant use. this hardly disqualifies it from being traditional and the fact that we know its origins is totally irrelevant.

SteveG