This list of institutions includes: 1) archives and libraries containing books of polyphony; and 2) institutions related to musicians or other people mentioned in this digital library, including generic institutions without a building or precise geographic location, such as "Capilla de Felipe II" [Philip II's chapel], to associate a musician with a particular music ensemble. In order to avoid duplications, any given institution, such as "Catedral de Salamanca. Archivo", serves both to indicate the location of polyphonic books in its archive/library and the institution where musicians could have worked throughout its history.