It is physically certain that given two simultaneous loud and prolonged tones one can hear a third tone, different from the played sounds: with these words taken from his essay Trattato di musica secondo la vera scienza dell’armonia published in 1754 Giuseppe Tartini (1692-1770), celebrated violinist, and researcher of musical theory and “physico-mathematical harmonist” (Barbieri, 1990) introduces his discovery, made some years before (in 1713), of the so-called third tone.