The house of Mario Maggi, violin teacher at the School of Violin Making in Cremona, welcomes an important correspondence and an extraordinary collection of musical instruments. The teacher collaborated, since the years of the war for the entire second half of the '900, to the collection of ancient documents and reproductions, reconstructions of musical instruments of Baroque and Renaissance. His is the discovery of the fundamental similarities between the paintings of the early '500 (period of the birth of Andrea Amati) attributed to Campi or Altobello Melone in San'Abbondio and St. Maria Maddalena. 4-string instruments with peaks can be related to the "violets Lanfranco" or with geigen of Virdung and Agricola and appear as violins archaic precursors of the Renaissance violin.