In Chile in recent years, attempts to provide access to written musical repertoires of the nineteenth and twentieth centuries has increased. This article shows the most important aspects of the generation, history, and organization of the music repositories existing in the Seminario Pontificio Mayor de los Ángeles Custodios of Santiago, the Biblioteca Patrimonial de la Recoleta Dominica of Santiago, and the Archivo Central Andrés Bello of the Universidad de Chile. The cataloguing, conservation, and digitalisation of their materials has led to the dissemination and appreciation of this music, which is now openly accessible to the entire scholarly community. It should also be noted that much of this repertoire, mostly unknown but also undervalued, was not included in the discourses of twentieth century Chilean music historiography.