It seems to me that no matter what we decide traditional means here, it will continue to be used in a variety of fashions everywhere which will not specifically mean whatever we define here. What we are all attempting to create is an operational defination without any operation in mind. Why not create a new word for any meanings which might be significant, because as it is used, Traditional is used in so many ways that it is too ambiguous to use as a technical term. If I have an event 3 years in a row, I call it a new tradition. If you want a technical term, make one up. How about "Legso" defined as "Any song regularly passed through the oral tradition" and "Advanced Legso" as "Any song passed through the oral tradition for over 50 years" and perhaps "Modern Legso" for anything over a few hundred years old and "Classic Legso" as anything over 1000 years.