Origins: Spanish Fandango (open G) and Sebastopol (open D)

Forgive me for writing in English, but I do not speak French, and my French-speaking daughter is away at school. Hopefully, a kind reader will translate this message. I've done a study of how open G and open D played a role in the development of blues guitar. If you are interested in this subject, my research is published here:

Jas Obrecht Music Archive: Blues Origins -- Spanish Fandango and Sebastopol

Thanks to you Jaz !

It's already linked there few minutes ago :
https://slide.forumactif.com/accordages-open-tunings-f8/une-petite-istoire-des-opens-g-spanish-et-d-vestapol-t6038.htm

The joke is that this has be done by a member called "Sebastopol" !

Very interesting stuff !