Unknown outside of Quebec but a true master composer and player of acoustic guitar : Serge Fiori. He put out 3 albums in the 70's with a group called Harmonium
If you can find this music, it is well worth a listen...a lot of 12 string guitars. The first two albums are all acoustic with no drums. And, yes, it is in French but mostly instrumental.
Interesting that you mention Serge Fiori. He's a great rhythm player. I have all the Harmonium albums (on vinyl)!