They’re included in the American experience “funk” documentary.
https://youtu.be/QrgV35cBHVs?si=cPW106BBBUHYABk0?t=28m52s
It’s pretty fun. Late 60s San Francisco “hippie funk.”
I got almost to the end.
Then it went Wonder Bread and focused on Elton John and David Bowie.
PBS gotta sell tote bags to dad rock fans.