?

Yamandu Costa

another composer/ acoustic guitar player from Brasil, genius to some / "cheap" player to others...
his style is 'very bizarre.

some free sheets here:
Yamandú Costa - Site Oficial

I guess he had lessons with Lucio Yanel from Argentina, who's also worthy of listening. Like Raphael Rabello, he developed his style on a 7-string

edit:

That's also the DVD... with fully improvised stuff