Since there is great pressure from the Establishment to deliver the songs which all hallowed Robert The Burns put his mark in the way we believe he held them, and much effort is put on keeping them fixed and frozen, then the traditonal or folk process is not allowed to work on the songs - so they are not traditional in that sense. Nor do they meet the other criterion of 'traditional' - that we do not know who made them. Of course there are as well the traditional songs that Burns collected and did not claim, but his worshippers claim for him - pooh upon those people. In the books they usually label Burns' own songs as 'national' rather than 'traditional' - another form of group ownership over what an individual created. Which brings us to what the loose meaning attached to 'traditional'or 'folk' is - we want it to belong to all of us, so downgrade the identification of who made it. A few examples are mentioned above, but there are many more that the scholars have given us clear provenance for - but we do not want to know.