It is the most prominent part in our archive and it includes both original documents and copies. In this section, you may find antique musical scores and the original scores of 19th and 20th century works, the modern editions (in particular those of musicians from Bergamo: the critical edition of the Opera Omnia of Pietro Antonio Locatelli and Daniele Maffeis) librettos (we signal the presence of copies of librettos of the first representations of works by Donizetti and Mayr), Donizetti’s autographed copies (among which the score of the final scene of Pia de’ Tolomei) and digitalized copies (the whole collection of Donizetti’s autographed copies now conserved in the Conservatory S. Pietro a Majella in Naples), Mayr’s and other authors’ autographed copies (the digitalized copy of the autographed works by Antonio Capuzzi which are conserved in the Istituto Musicale Donizetti in Bergamo). The collection of original letters is quite conspicuous and it includes the Fondo Mandelli (more than 1500 letters by authors such as Mayr, Donizetti, Bellini, Meyerbeer, Ricordi and so on), both purchased and donated letters by Donizetti, Mayr, Verdi, and a series of document dealing with the family of the composer. The source gathering activity has led to discoveries of exceptionally scientific value and contributed to the concentration of documents in the birth town of the musician.