"Indagine su un cittadino al di sopra di ogni sospetto" ("Investigation of a Citizen Above Suspicion"), directed in 1970 by Elio Petri, and starring Gianmaria Volonté and Florinda Bolkan, can be considered the masterpiece of Petri and a triumph of perfect synergy between a director and his composer. The score by Ennio Morricone is considered also one of the milestone soundtrack in his discography. The 2007 deluxe edition re-issue of this soundtrack is enhanced by several unreleased materials including "Main titles" (M1) and "Finale" (M18).