The Changeling (1980)

The Changeling is a 1980 horror film starring George C. Scott, Melvyn Douglas and Jean Marsh. The score was composed by Ken Wannberg, Rick Wilkins and Howard Blake. The soundtrack does not seem to be readily available. This is a sad -a tragic- story, rather than a scary one.

In pieces at youtube, here's part 1:

part 2, part 3, part 4, part 5, part 6, part 7, part 8, part 9, part 10, part 11

Roger Ebert says it's good technically but not at drawing you into caring about the characters. Moria says,

in the end perhaps the film is just a little too sedate and old-fashioned for its own good – Medak never quite lets his scares go often enough and mostly the film ends up being carried by the story which is structured with a sense of deepening mystery.