Profondo Rosso (1975) by Dario Argento
aka: Deep Red

When lithuanian medium Helga Uhlmann (Macha Méril) gets sent dangerously weird screaming thoughts in the middle of a conference for parapsychologists, a murderously looping childrens’ song will very soon be played for her as well as for all the following victims. Witness to murder and virtuous pianist neighbour Marcus Daly (David Hemmings) gets obsessed to reveal the dark lurking secret behind the killing melody.

seen at: pickledfeet private video collection