I'm lucky to have seen so many of those mentioned, especially since I live in the US. I sure wish I had seen:

The Left Banque

The Lyres

The Sonics

Odetta

Laura Nyro

Lee Morgan

punkfolkrocker: Sam the Sham was a great live act. I saw them once at the Hollywood Bowl with The Kinks as opening act and The Beach Boys as the headliner.