@Misc{BDCM20214779424, title = "\textexclamdown Ay, ay, ay! [M\'{u}sica notada] ]: serenata criolla para canto y piano", author = "P\'{e}rez Freire, Osm\'{a}n, 1878-1930", publisher = "La Paz : El repertorio musical", editor = "El repertorio musical", URL = "https://bibliotecavirtualmadrid.comunidad.madrid/bvmadrid_publicacion/es/consulta/registro.do?id=517700", year = "1917", }