String instruments can be made with different methods, but Cremona's luthiers developed a technique considered as unique in the world. Each instrument is handmade and assembled with more than 70 different molded pieces of wood. Every part of a new violin requires a particular technique, continuously adapted according to the different acoustic response of each piece of wood: for this reason, it is impossible to get two violins exactly identical. Every part of the violin should be made with a particular kind of wood, carefully selected and naturally seasoned, so that its preparation can be neither forced or artificial. Realizing the Cremona's traditional violin, it is not possible to use any industrial or semi-industrial part, and spray painting is prohibited. Many of the elements of the musical instrument are apparently only ornamental, but in reality they are highly functional in order to get the force and the sound amplification, or to protect the instrument from accidental breaks: this is a double characteristic of the first violin's creation. The violin construction process is personally followed by the violin maker in every phase, from the tree to the finished instrument: for this reason a Cremona's violin maker can make only 3–6 violins per year. The traditional violin making requires a perfect knowledge of all the natural materials and the know-how techniques passed down from generation to generation through words, gestures and habits shared since the 16th century, when the Cremona's violin making became popular, thanks to the skills of the house of Amati, then improved and refined by Stradivari, Guarneri, Francesco Rugeri, Vincenzo Rugeri, and Bergonzi.
Protection
The ancient tradition of Cremona's violin making is protected by two supervisory bodies: the Stradivari Violin Makers Consortium and the Violin MakingItalian Association, which represents more than 140 craftsmen. In addition, the Cremona International Violin Making School was founded in Cremona on 12 September 1938. After the UNESCO recognition, it was opened in 2013 the new Museo del violino at the Palazzo dell'Arte in Cremona, full renovated and with a new auditorium to listen music played with old and new instruments made in Cremona.