@book{
  author = "Monteverdi, Claudio, 1567-1643, Malipiero, Gian Francesco, 1882-1973",
  title = "Il quarto libro de madrigali a cinque voci",
  year: [19
  key = "Madrigals",
  key = "Choruses",
  key = "Secular (Mixed voices)",
  key = "Unaccompanied",
  publisher = "Universal Edition",
  address = "[Wien]",
  series = "Tutte le opere / di Claudio Monteverdi ; a cura di G. Francesco Malipiero ; tom. 4",
  ISSN/ISBN = "9783702411534 [3702411534]",
}