Main Instrumental pitch at 18th cent Italy . was not an organ pitch, but so called instrumental pich (fluctuated from city to city in Europe circa 409-421, each city has different one , but mainly in those limits, except France,where it was lower) but violins only SOMETIMES tuned up in Chorton (one step up from instrumental pitch). So, we know a lot about pitch Stradivari had in mind. READ HAYNES!