"Sigismondo d'India has a "twin", a "mirror" in music: Claudio Monteverdi. Both men developed, in parallel, a style that radically changed the history of music. A style inherited from composers such as Luca Marenzio and Carlo Gesualdo, but which d'India and Monteverdi were to transform through the creation of new techniques, theorised by the latter in 1638 under the name seconda pratica, which consisted in breaking the rules of counterpoint in order to express heightened emotion ... effecting the transition between Renaissance and Baroque".