Very nice effort with the video, it was interesting to watch. I have to agree with ekm here, I’m glad Friedkin kept his vision in mind and didn’t buckle when it came to the score.
It´s a vid I made, re-imagining the film if Friedkin accepted Schiffrin´s score. The music is the Amityville Horror theme, which, was, part of it, originally to be used in The Exorcist. Here´s the link:
The Amityville opening theme is a heavily reworked version of the proposed music… But selections of Schifrin’s actual original score have been released.