The Stradivarius instruments are famous for the quality of sound they produce. However, the many blind experiments from 1817A guitar-like violin made by the naval engineer François Chanot, a member of a family of luthiers. A committee of scientists and musicians, listening to the violins played in an adjacent room, judged Chanot's violin to be at least as good as the Stradivarius, but apparently Chanot's instruments quickly lost their good qualities. to as recent as 2014 have never found any difference in sound between Stradivari's violins and high-quality violins in comparable style of other makers and periods, nor has acoustic analysis. In a particularly famous test on a BBC Radio 3 programme in 1977, the violinists Isaac Stern and Pinchas Zukerman and the violin expert and dealer Charles Beare tried to distinguish between the "Chaconne" Stradivarius, a 1739 Guarneri del Gesú, an 1846 Vuillaume, and a 1976 British violin played behind a screen by a professional soloist. The two violinists were allowed to play all the instruments first. None of the listeners identified more than two of the four instruments. Two of the listeners identified the 20th-century violin as the Stradivarius. Violinists and others have criticized these tests on various grounds such as that they are not double-blind (in most cases), the judges are often not experts, and the sounds of violins are hard to evaluate objectively and reproducibly.
