I just came across an exciting BBC documentary on Louis Armstrong's East Germany tour, which did include Leipzig, my hometown since 1992. I grew up in West Germany, but moved here in order to persue my dream job: become a librarian. Well, I can call myself one, but it's IT where I landed. But I see a definite connection, just as libraries are to be resources for entertainment and education, even emancipation for the individual, I see Open Source as an analogue.
When I started listening a bit to Louis I excitedly found that he also visited Leipzig. And the story around that gig (and the whole tour) is exciting. And finding a BBC documentary on it is even more exciting. https://www.bbc.co.uk/programmes/p07gr1jg
The show is a podcast, which means you can download the show.
And I just even found the recording of a TV broadcast: https://m.youtube.com/watch?v=gEdq64SIp4E https://m.youtube.com/watch?v=okYPiP7K8OQ
I know the Berlin concert has been released on CD. It's now back on my toBuy list for sure.
By the way, in case you are interested and are able to read German, there is also a book on this tour. I wanted to buy it, but forgot about it completely. https://www.epubli.de/shop/buch/What-a-wonderful-world-Stephan--Schulz-9783745052442/62816#beschreibung
Here are a few more articles. Sorry, German only. https://m.spiegel.de/einestages/louis-armstrong-jazz-musiker-auf-ddr-tournee-1965-a-1024665.html https://www.mdr.de/zeitreise/stoebern/damals/armstrong144.html https://m.lvz.de/Leipzig/Lokales/Aufgetaucht-Hundert-Mark-Schein-den-Louis-Armstrong-in-Leipzig-unterschrieb https://www.deutschlandfunk.de/louis-armstrong-in-der-ddr-ein-musiker-der-tore-oeffnet.871.de.html?dram:article_id=314665