These days I doubt there is any music genre that does not have traces of influence from traditional music no matter how one defines it. Much like the human genome project and finding out that everyone is related if we look back far enough. There is nothing sacrosanct about music other than the music itself. Our likes or dislikes do not disturb the reality that history is a continuum, not a snapshot. The problem with oral traditions is that sooner or later someone has a different idea or perspective to add, and the oral part of the tradition becomes as true to itself as the paper it's printed on.