Hi

For quality of voice combined with stage presence I would have no hesitation in selecting Nana Mouscouri. Spellbinding.

Also agree with others with Gordon Lightfoot, Emmylou Harris, Harvey Andrews.

The best voice I ever heard in a performance in a folk club ( opposed to in concert) was Fiona Simpson from Therapy. ( Dave Shannon as one of the best folk musicians.

Cheers

MikeL2