I just watched your video, Dan (very nice, btw), and no ads appeared so they may just have been trying it on.

I have had similar experiences with traditional songs and I challenge them as a matter of principle through the You Tube system. You don't get any reply to the challenge, which is par for the course but at least I have made my views known. If nothing happens after that I am not really worried, but I would rather ads didn't appear on the "offending" videos.

I suspect that some of these organisations use web crawlers and look for keywords and claim as a matter of course whenever one is found.

There seems to be some inconsistency as I have posted my recordings of two tunes by Tom Anderson and I have had a copyright notification against one but not the other.