A short theory primer.
https://www.musicshopeurope.co.uk/guitarist-s-abc-of-music-musnov630150?returnurl=%2fsearch%3fq%3dmusnov630150%26substoreid%3d
Misprints-in-Scores/The-Guitarists-ABC-Misprints-and-Original-Markings-in-the-scores-of-John-W.-Duarte.pdf
