Here's a YouTube where Stefan Grossman gives a lesson on open tunings, with history, and in a NE US accent. I mention the accent so you will understand, for example, that "pawlah" is "parlor."


https://www.youtube.com/watch?v=pdY8CsSrmmU
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He seems surprised that 19th-C parlor music made it into guitars in the hands of black Americans. Hello? They worked together, and black people were servants in white homes. They heard, they liked, they learned.

Now I'm going to see if I can find Spanish Fandango online.