Even so, distribution is publication. If you distribute, the owner of the performance is entitled to fair notice.

For example, Gordon Bok allows me to record his material at performances. He has stipulated that the material is his copyright and will not be distributed without his permission. This includes traditional material or other author material which he sings. He makes sure that those people get compensated for their efforts.

When "The Lion King" came out, the family of the person who wrote the original song eventually won a battle over The Lion Sleeps Tonight, even though there had been substantial changes which had invalidated the original copyright. The person who wrote the original song had, in the intervening time, died in poverty.

Bob, your intent is laudable. The knowledge should be preserved. The performers should, at least, be able to authorize the use of their material.