YouTube flagged the audio as infringing on some commercial recording even though it was a live performance of very old traditional tunes; apparently the software matched three jigs to someone's CD version. They put the burden of proof on me,caught in an overly wide net. Luckily Vimeo's more laissez faire.
Youtube just passes the buck to some copyright holder who in my case at least was completely unrelated to my recording, other than coincidental order of tunes. I don't know, maybe three traditional tunes played in that particular order can be copyrighted, though that's a bit ridiculous. Thousands of performances of traditional music would suddenly be infringing.
I was happy to give Vimeo my money to get around this, and I doubt I'll be giving Youtube money for any of their commercial offerings, until they can straighten this mess out. I do understand they're probably overwhelmed with sheer volume, but still.
And, of course, I've never heard back from the copyright holder, who has no incentive to get involved.