Remarkably, and for the first time ever, two giants of the classical guitar have been brought together in print. A gap of 124 years separates Napoleon Coste’s Op. 38 Etude no. 23 and Agustin Barrios’ transcription of this challenging study, and his simple 2nd guitar part for his students. This edition contains 5 scores: Etude No. 23, Estudio de Conceirto (Barrios’ arrangement of etude 23), Barrios’ student guitar part for it, duo 1 – Coste with Barrios’ Student part, and finally duo 2 – Barrios with his student part.