The Changeling is a 1980 Canadian supernatural horror film directed by Peter Medak and starring George C. Scott, Trish Van Devere, and Melvyn Douglas. Its plot follows an esteemed New York City composer who relocates to Seattle, Washington, where he moves into a mansion he comes to believe is haunted. The screenplay is based upon events that writer Russell Hunter claimed he experienced while he was living in the Henry Treat Rogers mansion in the Cheesman Park neighborhood of Denver, Colorado, in the late 1960s; Hunter served as a co-writer of the film.

https://en.wikipedia.org/wiki/The_Changeling_(film)