All of these words being bandied about 'folk', 'traditional' etc. have different meanings in different contexts and are perhaps best dealt with loosely without rigid definitions. Certain characteristics can certainly be applied but even the 1954 definition has been discredited in academic circles. No-one in ethnomusicology or study of folklore now accepts that knowing an author has any relevance to the subject at all. We know the names of many authors of songs nowadays due to lengthy research. That surely doesn't mean that these artifacts they originated now cease to be part of a particular genre other than the genre of songs without known authors.