A number of songs in school songbooks use tunes from some country, but the words are completely unrelated to the tune; the whole is then assigned to the tune's source country. The name of the person who provided the "marriage" is given but no refernce is made to the source tune. Sometimes the tune is slightly altered to fit the lyricist's "poetry."

I have dozens of school songbooks; a common fault is the poor information provided with the songs.

A bastard kind of "fusion"?
Crediting the whole to the country of the tune's origin, without proper references, is misleading at best.