The Archivio Storico Ricordi holds the historical records of one of the most important music publisher of all times. For almost two hundred years, beyond their main business as music publishers, the Ricordis were also impresarios, agents, and cultural organisers, and played a central and unique mediating role within Italian musical life. This role is very well documented by some 30,000 autograph letters addressed to Casa Ricordi by composers, writers, librettists, singers, and conductors, and an impressive and neatly ordered collection of around 600,000 sent letters. The whole collection will be published online bit by bit. The goal of the project is to connect the letters not only with the relevant records of the Ricordi archive (ledgers, contracts, stage designs, scores, pictures...), but also with other music archives over the web.