"There's about-a-hundred-years-old recordings of the Englishman Joseph Taylor singing unaccompanied in the EFDSS"

Joseph Taylor was recorded in Lincolnshire by the composer Percy Grainger over several visits between 1906 and 1908. The famous recordings (released by the Gramophone company in 1908) of him were actually done at studios in London. Graingers friend Delius also used them as the basis for his piece 'Unto Brigg Fair' for full orchestra, which Taylor was at the premiere of and was reportedly very proud of.

None of this gives any validity to your earlier point. And I'm not sure what 'the compleat angler' has to do with anything.

"I've also read and heard on TV documentaries that in the 17th century there was an English cittern in nearly every barber-shop and tavern in England "

Well it must be true then...

The problem here is that there are more than a few people on this board who have devoted their life's work to research of traditional music and customs. In another thread you used something you saw about Bob Copper on TV to argue a point against people who knew him well. Now you are trying to use an irrelevant piece of information about Joseph Taylor (which you haven't even got correct) in front of people who are experts in their fields.

Drop it. You are not doing yourself any favours.