Classic Horror: The Mephisto Waltz (1971)

              
The title of the purportedly most difficult piece every written for piano, by Franz Liszt. You get to hear parts of that piece quite a bit in this horror film. The aging grandest piano player alive, Duncan Eli (played magnificently by German master actor Curd Juergens), is quite obsessed with this piano solo. While giving a young music journalist Myles Clarkson (Alan Alda) an interview, he recognizes Myles' large hands, and starts to invite him and his beautiful wife (Jacqueline Bisset) into his circle of friends. Of course, he has ulterior motives to do that ...
It is amazing how this film from 1971 can still conjure up a good deal of chills. A demonic soundtrack and moody camera settings together with great acting are all that it takes. No gore is required, and when in one of the most dramatic scenes the devil himself appears, actually showing him would only have detracted from the suspense already built up, and no image of him would have been able to scare you more than the look on the face of Bisset summoning the Master.
Great acting from Juergens, two even in today's world stunning actresses (Bisset and Barbara Parkins as Duncan's daughter and then some), fantastic music and soundtrack, a great story with a few unexpected twists: a classic but still relevant after all these years!

In another words adapted from a Fred Mustard Stewart novel, this offbeat occult thriller stars Alan Alda (just prior to his eleven-year stint on M*A*S*H) as journalist and burgeoning musician Myles Clarkson, whose long-sought interview with ailing concert pianist (and closet Satanist) Duncan Ely (Curt Jurgens) leads to a mysterious ritual in which Ely's soul is transferred into Clarkson's body at the moment of the elder man's death. Further complications ensue when Myles' wife Paula (Jacqueline Bisset) discovers the none-too-subtle change in her husband's behavior, and she is pulled deeper into Ely's twisted circle. The plot thickens as further soul-swapping, dark family secrets, and demonic possession come into play. A heavy sense of doom pervades this bizarre film, thanks to some offbeat cinematography and eerie music, as well as some truly shocking setpieces courtesy of prolific TV director Paul Wendkos, who helmed the excellent Legend of Lizzie Borden. The prosaic Alda lacks the dangerous edge his character demands, but Bisset's performance is chillingly effective.