Julia Trintschuk plays Sonata No. 1 Allegro by Carlos Guastavino on a 2016 Roy Fankhänel Special Edition guitar. This comes via the excellent Siccas Guitars and their fantastic YouTube channel. “Carlos Guastavino (1912-2000) was one of the foremost Argentine composers of the 20th century. His production amounted to over 500 works, most of them songs for piano and voice, many still unpublished.” Read more about him via Wiki. I don’t know much about Guastavino but he did write three sonatas for guitar and a handful of chamber music including guitar which is treat considering his output for other instruments.
Sheet Music: Three sonatas via Sheet Music Plus (I haven’t seen this edition): Sonatas 1-3 by Guastavino