Gdnrad obit here.
This is fantastic. Glastonbury 1971:
https://www.youtube.com/watch?v=KbY7c1mVlOM
And (not great quality, but I had a hard time finding a version of this with Swarbrick playing) obviously:
[UPDATE March 21, 2021]: Looking for the latest On Beyond Zarathustra? It’s here. I’m updating old posts with outdated links.
(The rest of this old post was obsolete so I deleted it.)