Les: like you, we sat enraptured at home watching Sister Rosetta hoicking out that guitar and blasting off. Certainly a blue plaque job, preferably a vido screen on some nearby wall permanently playing that clip?
Pity Sister R T wasn't more widely publicised in those days. Alas, most English girls followed the Baez route for how to be a folksingers. A few more Tharpes and a few less warblers would have improved the 60's scene no end.