It was much harder to establish all the details in the past, and many of the errors of the 1950s-80s could be forgiven, were it not that the vested interests concerned so often resolutely refuse to correct their mistakes, or to make appropriate financial recompense.

Such errors are no longer easy to excuse. I recently received a review copy of a record by Sean Keane and his brothers, on which both The Logger and Qué Sera, Sera are described as "traditional". There's no excuse for that kind of laziness in a professional performer; it took me about ten minutes to find out authors and copyright dates (still very much current) for both.