This document discusses the mystery behind Stradivarius violins and their renowned tonal quality. It introduces Antonio Stradivari, the famous Italian luthier who made the instruments, and poses questions around what makes his creations superior and how their sound can be replicated. The document explores various theories for the secret of the Strads' success, such as the trees used, drying time of the wood, and varnish technique, but leaves the mystery unsolved.