This article seeks to expand the current knowledge about the circulation of music in the Viceroyalty of Peru, through a comparative study between music scores from the colonial period that have been preserved in the cathedrals of Lima and Santiago de Chile. Contributing with new musical and calligraphic concordances, it shows that some of the works held in Santiago were copied in the viceregal capital. It also raises convincing hypotheses about the possible Spanish origin of certain musical sources, as well as methodological contributions for the study of music copyists, complementing the existing ones. Finally, it goes on to question important assumptions about the musical life of Lima cathedral that have been transmitted in previous works.