Unfortunately, most of the old live recordings of
Leo Kotke when he was young, that people have put online, are pretty poor audio quality. And those with perhaps better sound are where he has aged after problems with his fingers and hearing, and he's arguably lost some quality of technique.
So one is left with the albums themselves.
The tracks of the first called "6 And 12 String Guitar" (1969) can be played here (it's a classic that instantly won him fame):
https://www.youtube.com/playlist?list=PL...LcLXbSZnpL
The one below is his 4th, from 1972, apparently recorded straight from the vinyl (light needle crackling). Those earlier albums are where he is still playing guitar alone. Whereas later in the 1970s, the studio productions begin adding back-up instruments.
Leo Kotke: "Greenhouse Album" (1972) ...
https://youtu.be/nJYfuTH_CvA
https://www.youtube-nocookie.com/embed/nJYfuTH_CvA