i can't find a satisfactory interpretation of la folia; but you can get the cd versions of the performances i mentioned eaily at stores; i will be more than happy to post every now and then, early and baroque pieces which i think are pleasing.
here is ton koopman's understandiong of bach's toccata:
btw, the violins and violas used in 17th century are quite different from those in the 19th and 20th centuries and they do not sound as lush and rich; that affects, subtly but decisively, the techniques in playing the instruments, and finally the composition of music itself;