I'm afraid that cd contains all sorts of mistakes and wrong information. Most of the material was simply copied from other people's websites (including this one), often without the accompanying background, source details and so on; and, apparently, with little or no effort made to check anything. It's probably very useful for folk who want basic raw material and don't much care where it came from, but to my mind it was made with a complete lack of respect both for the music and songs, and for the people who kept them alive for us, whether by playing, singing, "collecting", or publishing them.