Compounding the matter is songs that are derived from a variety of sources. Take the song "John of Dreams", for instance (admittedly not American, but bear with me) - It appears in the Ossian books as an Irish song, but the tune is staight out of Tchaikovsky's 6th Symphony. So is it Irish or Russian? Ultimately, does it really matter WHAT we call this stuff as long as it's performed by those of us who care about it?