Thanks, I have NYT subscription.

I don’t recall any of the Nagel Heyer CDs that I was serviced with or purchased being public domain, they were new recordings, although they repackaged and reissued some of them under new titles. I think they also created some compilations of different sessions. Look over the label listing at Discogs. I think the founder’s son ceased new recordings a few years after the founder died.

Very interesting piece, thanks for alerting us to it!