Yes, I cannot hear this song without associating it with The Exorcist. It is a beautiful piece of music, but wow….I just can't hear it without seeing Regan's face.
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And interestingly enough, the music was used in a rather innocuous moment in the movie….Chris taking a walk home from the movie set, instead of riding with her chauffeur.  (And just at the end of the movie closing with Fr. Dyer, before the credits start with the haunting violin piece.)