@book{
  author = "Monteverdi, Claudio, 1567-1643, Mendelssohn, Arnold, 1855-1933",
  title = "Zwölf Madrigale für fünf Stimmen",
  year: [19
  key = "Madrigals (Music)",
  key = "Italian",
  publisher = "C.F. Peters",
  address = "Frankfurt",
}