Until recently, this was the rarest score in the Goblin canon and many of the group's fans were not aware of its existence until the late '90s when it was put out by Cinevox as part of its Goblin reissue series. This majority of the score was penned by Italian composers Willy Brezza and Fabio Frizzi, with the group contributing to four cuts. The film Perche Si Uccidono was a drama about drug addiction amongst Italian youth, so the group doesn't get much opportunity to create the spooky soundscapes that usually dominated their work. In its place, they created a number of short, poppy instrumentals, including several with a pronounced soft rock feel to them: the best of these are "Edda," a lovely mid-tempo tune that features gorgeous wordless vocals from frequent Ennio Morricone vocalist Edda Dell'Orso, and "Ammoniaca," a gentle tune that effectively blends electric piano and acoustic guitar to create a romantic atmosphere. However, Goblin's atmospheric prog rock style manages to rear its head here and there: "Epopea" is a stirring track that highlight some fast-paced synthesizer soloing and "R.I.B." combines wordless vocals, layers of synthesizer, and a Pink Floyd-like groove from the rhythm section to create an atmospheric yet spacey mood piece. The result is a score that lacks the consistency and the distinctive personality that characterizes Goblin's best work but still offers enough quality tracks to appeal their fanbase.
AllMusic Review by Donald A. Guarisco