One of six films that director Lucio Fulci edited into his very own feature A Cat in the Brain (1990). The other ones are
Bloody Psycho (1989), Il fantasma di Sodoma (1988), Massacre (1989), The Murder Secret (1988) and Touch of Death (1988).
The main theme plays 18 times throughout the movie. 13 times sung by children, 5 times instrumental.
Inspired by the Brothers Grimm fairy tale, but has nothing to do with it besides centering around a young boy and girl.