The National Library of Spain has (online and downloadable) an MS,
described as a Metodo para guitarra , but in more detail, second
half of the 18th century.
(to download it, click on icon in left hand panel when the pdf opens)
Perhaps this is very well known already? Anyway, 1750 seems very
unlikely... 1790s, perhaps?
It starts with many pages in hand writing (in Spanish, of course and I
don't know Spanish), then pages of music theory, scales etc and then
pieces of music from pdf page 49. Perhaps the music is for a six-course,
rather than a six-string, instrument.
Strangely, for a tutor, no indications of fingering are given. There are
lots of short, attractive pieces, often in the keys of A and D but there
are a few longer pieces.
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