I don't know that a performance of Treemonisha couldn't be performed and recorded, just not distributed. As I said, I have a German performance on cassette that a guy in Sweden recorded off a shortwave broadcast and mailed to me. It's not very good (they actually turned some of the numbers into out-and-out jazz and some are stereotyped ragtime with pratfall sound fx--neither of which Joplin ever dabbled in) and is not available anywhere I've looked. But it was recorded and broadcast, so I don't think the ban extends to recording, only to distribution of the recording. Then again, maybe the laws are differnt overseas.

So there may be recordings ready to go as soon as the copyright runs out. Who knows?

As for the Sonny Bozo copyright extension, that was the biggest fraud ever perpetrated upon the music industry. I can't believe that was even allowed. That ranks up there with Michael Jackson buying the rights to the Beatles' songs.